So I successfully started up both by reseting the PRAM, and a soft boot (shiftt on start-up). The process is fairly painless and, if you have a bit of time and patience you can complete the task on a Mac. Target Disk Mode is useful for accessing the contents of a Mac which cannot be booted from its own hard drive. Manually restart: Power (⎋) 2. After a few moments, you’ll see all of the bootable devices appear on your screen accompanied by their corresponding icons and volume names. Network Boot; Hold down the N key while starting Mac to … The Mac OS X boot loader is located in /System/Library/CoreServices/boot.efi.When loaded by the firmware, it displays a dark grey Apple logo on the screen.Then it loads the Darwin kernel from disk, as well as the essential driverextensions. In fact the terminal is just asking you your password. If you have more than one bootable drive (or partition) on your Mac, you know you can get to the boot menu by holding down the Option key at boot time. Multiple shortcuts exist for the various methods of booting Leopard. Hold the keys until the animated globe appears on the screen. Comprehensive 5 minute tutorial. To use Target Disk Mode, reboot your Mac and hold down the T key as soon as you see the Apple logo. On running the test all appears fine/no errors, then restart, Apple Hardware Test appears again… Should I re-install the OS in recovery mode? The Mac Startup Manager works great if you have a number of boot options from which to choose, but your Mac also recognizes a few additional startup keys that direct it to boot immediately from a specific source. Its Maintenance module has tools to repair your boot disk, repair permissions, free up memory, and free up RAM. At least five keys have different names or symbols on a Windows keyboard than they do on a Mac keyboard, which can make it difficult to follow Mac-related instructions. Disclaimer: Some pages on this site may include an affiliate link. Keep holding Shift until you see a gray progress bar appear beneath the Apple boot logo.When triggered, Safe Mode will force a check of your startup volume’s integrity, load only the minimum required macOS kernel extensions, disable all user fonts, clear font caches, and disable all startup and login items. If you aren’t familiar with your system’s Terminal, however, it’s highly, highly recommended that you leave this to the professionals. If you're using a wireless keyboard, plug it into your Mac, if possible. Option: Boot into Startup Manager.From here you can select different startup disks if any bootable partitions are available. To force a shutdown, press and hold the power button for about 10 seconds. Ive tried recovery mode and a few other ways but the more i try the more im convinced I purchased a. I am basically trying to boot my Macbook Pro 2006, which has a broken screen, onto the Mini so I can create a Time Machine backup. It pulled up to disk manager and i was able to install. If it does not work, you probably did […] (SECOND OPTION on this page: When your starting up the computer hold down command+R, this will bring to the recovery section of the osx, which is more than likely still on your computer. Run the following command: 'Volumes/Image Volume/boot.sh' Choose the iMac internal hard drive and click the "Next" button. Apple has a reputation for making products that “just work,” but many Mac users may still need to occasionally troubleshoot their desktop or laptop. Unfortunately, I am stuck on this screen. Mac users may face sudden slowdown or the complete breakdown in using their Mac system. Contact Us | Privacy Policy | TOS | All Rights Reserved. You’ll also want to make sure you perform a PRAM reset after you replace your Mac’s hard drive, unless you like waiting five minutes for the system to boot while it searches in vain for the old missing disk. At this point, you can also use the Mac installation disk to boot your Mac from. ; Release the option key when you see the Startup Manager window. Now, reformat the corrupted APFS boot disk. I have a Time Capsule wifi connection, but I am happy to not restore to my new mini and access what I want later, if that is possible. This not only lets you easily access data on a Mac’s hard drive, but it also lets you use one Mac’s hardware to boot another Mac’s operating system and data. I’m losing my mind! Windows and Mac Keyboard Differences . Option-Command-P-R: Reset NVRAM or PRAM. Stay tuned with our weekly recap of what’s hot & cool. Macs aren’t special in that regard. That will reset the startup volume, and let you narrow down the problem. Nowadays, this boot flag is mainly used on AMD Hackintoshes, where choosing between 32-bit mode and 64-bit mode is actually important.-legacy Forces the "userland" of Mac OS X to boot into 32-bit mode. Your Mac’s parameter random-access memory (PRAM) stores important information such as the type and identity of your macOS system drive, the presence of any other internal drives, the number and type of connected devices, screen resolution, and speaker volume. Verbose Mode: Command (⌘)—… This site contains user submitted content, comments and opinions and is for informational purposes only. It got so frustrating that every time I pressed the icon of the disk on the desktop, the curser would go into non-stop spinning mode. Your MBP Retina has a faulty logic board and is probably covered under an extended warranty program. your mac is probably stolen and has the EFI locked either someone enabled it manually within the OS or someone activated “find my mac” to lock it. 1. Any ideas for intermittent spinning cursers? Temporarily change your startup disk with Startup Manager. Since this time i have a password of two caracters. The Mac will restart and it will boot from that drive. If your Mac is using a firmware password, it ignores this key combination or starts … CD/DVD drives are disappearing from computers, leaving USB storage as the only option when re-installing an operating system. macOS Recovery mode is used to install and reinstall macOS operating system. How to start the Startup Manager. I knew about the F12 key, but not as a hold-down start-up for stuck dvd’s. http://www.macworld.com/article/2056561/how-to-make-a-bootable-mavericks-install-drive.html, How To Check Your Graphics Card in Windows 10, The Best All-In-One Laser Printers [December 2020], How to Set Environment Variables in Windows 10, How To Record a FaceTime Call [October 2020], How to Scan & Fix Hard Drives with CHKDSK in Windows 10, How to Install YouTube Kids on Your Amazon Fire Tablet, How To Delete Your Gmail Address Permanently [October 2020], How To Speed Up Windows 10 – The Ultimate Guide, How to Install the Google Play Store on an Amazon Fire Tablet. Or use your built-in keyboard or a wired keyboard. To boot your Intel-based Mac into any of the macOS built-in startup modes, you must press and hold one or more keys detailed below after turning on the computer. What kind of keyboard are you using? Further, if your Mac’s drive lacks a recovery partition for any reason, you may still be able to access macOS recovery tools via macOS Internet Recovery, which loads the recovery information directly from Apple’s servers. If you’re using a Mac notebook computer with an external keyboard, make sure you press and hold the Option key on the built-in keyboard. The Mac will show all boot volumes by holding the Option key on startup. Way 2: Set a Mac Boot from USB Drive using Startup Disk. You can restart the Mac while in Recovery Mode by going to the Apple menu and choosing “Restart” from the menu options. Then after holding power button to force shutdown, I hear a chime but I rarely see the startup apple, if at all. Examples of when you may need to use the Mac Startup Manager include booting to your Windows Boot Camp partition, booting to a complete cloned backup of your system drive, or reinstalling macOS from a DVD or USB drive. [table id=11 /], Your email address will not be published. Restart using Boot Camp Control Panel: Click in the right side of the taskbar, click the Boot Camp icon , then choose Restart in macOS. Some keyboards have a light that flashes briefly at startup, indicating that the keyboard is recognized and ready for use. Copyright © 2020 Apple Inc. All rights reserved. Join over 260,000 subscribers! macOS Boot Modes and Key Combinations. Once the kernel gets control of the machine,the rest of the boot process is identical to PowerPC machines. The Shewolf’s answer is possible, but it could also be the result of a firmware password. Press the keys immediately after hearing the startup sound, unless otherwise specified. Tnx. Target Disk Mode is a very useful feature exclusive to Macs that, in effect, lets you turn your Mac into an unnecessarily complex external drive. Mac OS X Snow Leopard (and all versions beyond it) will boot into 64-bit mode by default. While in Target Disk Mode, you can connect your Mac to another Mac via FireWire or Thunderbolt and see the contents of the Mac’s drive mounted on the second Mac as if the drive were an external FireWire or Thunderbolt device. This does not effect our editorial in any way. As an alternative, you can start your Mac in Safe Mode (Recovery Mode). Obviously a reader is here because they need to perform one of these tasks. Please my MacBook Pro has a flashing question mark folder and I have tried all the options, from Command+R,Command+Alt+P+R, holding down the Alt/option button but none is working on my Mac. From there, you can enter UNIX commands just like in Verbose Mode. Leaving Recovery on a Mac is easy: simply reboot the Mac again to leave Recovery Mode. Shift: Start your Mac in Safe Mode.Since safe mode only loads essential software, you can determine whether a system process or a user-installed application is causing your problem. They require some goddamn password. Single User Mode is a way to enter UNIX commands related to your Mac’s startup from the Safe Mode desktop rather than the pre-startup screen. Have you tried not connecting to any network during initial boot? ; Click the arrow or press return on your keyboard. There’s a whole lot going on when your Mac boots, but Apple, always concerned about design and user experience, hides the details behind the familiar light gray boot screen. It’s an apple keyboard. I’d recommend using Stellar Phoenix Utilities that works best with all the latest Mac OS. That will ensure that power is cut, and when you press it again to restart it, the Mac will boot fresh again and take you through the OS X setup. ** Booting a Mac from a … Simply reboot your Mac and hold the Option key on your keyboard as soon as you see the Mac’s startup Apple logo. Note that settings such as resolution and system speaker volume will be set to defaults, so don’t be startled if your Mac’s sound effects are a bit louder on the second boot. You’ll soon see quickly moving rows of text instead of the gray boot screen, and you or a tech support rep will be able to see exactly what is causing the issue you’re attempting to troubleshoot. When you hear the startup chime, press and hold the Option key. Help! Finally, some drive partition configurations can result in macOS’ installer reporting that it cannot create a recovery partition for Recovery Mode. Apple Hardware Test continues to appear on start-up. This is a terminal interface that allows you to login and interact with your computer via text input only. This makes booting your Mac a simple and pleasant experience, but can also hamper troubleshooting efforts.To see what’s really happening during your Mac’s boot process, you’ll want to enable Verbose Mode, which lets you see the messy details during boot in order to identify any drivers, kernel extensions, or other issues that are causing your Mac grief. To get started, boot your Mac in Safe Mode by holding down the Shift key at startup. You can also enter UNIX commands into this, just like a standard Command Terminal. As long as the Mac is compatible with the operating system contained on the selected drive, your Mac will continue booting the designated operating system. To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or after your Mac begins to restart. Then, from the Disk Utility sidebar, select the volume that you’re using and choose File > Mount from the Menu bar at the top of the screen. Hello my Mac has a flashing question mark folder and I tried: command+r,command+alt+P+R and all of it and it stays a flashing question mark folder? A recovery partition will be created by default on new macOS installations and upgrades, but not every Mac configuration is supported, including RAID system drives. Once you’re familiar with these options, however, just use the table below as a handy guide in case you forget the specific keys necessary for each option. You’re going to need to power your Mac up and then press and hold all four keys simultaneously as soon as you see the Apple logo. To use these Mac startup commands and launch a specific boot mode, you must first press the power button then immediately press and hold the … Boot from CD/DVD: C 3. If your Mac isn’t acting as expected, a PRAM reset is usually the first and easiest troubleshooting step to try. Yup. Preview the scanning results, choose the files and then click "Recover". That worked fine. For Mac users, we recommend visiting Apple’s support page on USB boot media. Getting your Mac to load from a USB drive is fairly straightforward. You don't without modifying things on a low level or adding custom software like the awesome Boot Runner.When a mac can't find the first viable image to boot, it's programmed to get the prohibitory icon - not the boot picker.. Intel Macs have the following basic behavior at boot time when the chime indicates a successful POST. ; Start up from Apple Hardware Test or Apple Diagnostics: D If there are issues with your Mac … From here you can isntall a new version of OSX. Thanks. I purchased a secondhand Macbook Pro from a Buy/Swap website and it had Windows 7 installed in it. Once you enter boot screen, check for bootable devices and select the one which you want to boot into Mac OS X. Eject, F12, or Mouse/Trackpad; If you unable to remove discs that are trapped in your optical drive, then restart your Mac by holding Eject key, F12 key, or your mouse or trackpad button. Command (⌘)-R: Start up from the built-in macOS Recovery system. . Booting from a CD? I have a wireless keyboard I can try. I have tried every command there is but I still have an issue with my MBP Retina 15 (mid 2012) randomly shutting down, with a freeze-like blackscreen, and key lights still in. Some time back, a disk would not release from my iMac Superdrive. To reset PRAM, shut down your Mac and find the Command, Option, P, and R keys on your keyboard. :). I have a usb keyboard and mouse hooked up, but hope to switch over to my apple blue tooth ones. Do you recommend re-installing the OS? Question: Q: Mac Pro 2010, boot options disabled More Less. Keep holding the keys until your Mac reboots itself and you see the Apple logo appear and disappear a second time. Sierra, High Sierra, Yosemite, etc.) Most Mac users will probably only ever use the single drive that came with their system. . Immediately press and hold the Option key. To boot from a CD or DVD: Restart your Mac while pressing the C key. Try rebooting the Mac again but hold down the OPTION key to see your boot options on the Mac at startup. Choose "No security". It happened to me too. Part 4: How to Boot Mac into Recovery Mode with Local Recovery. Insert the USB boot media into an open USB slot. Safe Boot can be a crucial troubleshooting step when you're having problems with your Mac.These can be problems with starting up your Mac or issues you come across while using your Mac, such as having apps not start or apps that seem to cause your Mac to freeze, crash, or shut down. If you’ve ever worked in the Windows world, you may be familiar with Windows Safe Mode, which starts the operating system with the bare minimum level of drivers and software to help you isolate the cause of a software issue or conflict. Is this what you see when you try to boot your Mac? Enter your admin password when prompted. This will allow you to make sure your Mac starts up from a trusted startup disk. On startup, My screen suddenly started to look like you image of your “safe mode”, except it does not say “safe mode”. Startup Manager allows you to pick a volume to start from while the computer is starting up. But instead of finishing the boot and bringing you to the default macOS login GUI, it gives you a text terminal that can be used for everything from advanced troubleshooting to hard drive repair. This is a great way to free your startup volume when you want to test it or optimize it using a commercial utility. To prevent more issues occurring when starting Mac computer, you can stop some programs from running at Mac startup . Am I missing something simple? Learn about the Mac features and tools that you can access by holding down one or more keys during startup. Maybe the keyboard will solve it. I don’t have a new install of OS X in front of me, so I can’t recall the exact order, but at some point during the OS X installation process it will ask you to connect to a Wi-Fi or Ethernet network. Hold the "Command" and "R" buttons until the boot chimes are triggered. The Mac Startup Manager will update as needed, so if you add or remove bootable drives or devices on your Mac, the list will automatically display the current options. I held shift + R, and put a usb with catalina dmg in my mac while connected to the internet. Trouble is I can’t get out of this screen. Will access other data later! To use it, press and hold the Shift key on your keyboard as soon as you see the Apple logo. The issue is related to Windows/Bootcamp, I would suggest two options: I can ask the 'host' to move this post to Windows Software / … This will disable secure boot. If it’s a bluetooth wireless keyboard, you have to wait to hit the Alt key until you hear the startup chime, as the Bluetooth drivers don’t initialize until that point. I didn’t know this Mac was so delicate and not idiot proof. Keep holding until the described behavior occurs. You can also change what your Mac does by holding down … Biggest problem now is I can’t get past this screen. I then rang to book it into an Apple shop. my macbook pro is in safe mode but i can get out of it? Here's a handy guide to the full range of Mac boot options and startup keys, as well as when you might need to use them. If it’s a wired keyboard, try switching it with another keyboard, if you have one. Thanks! You can use it to reinstall macOS, restore from a Time … It’s important to read over the description of each Mac startup option to ensure that you understand its use and purpose. Jim Tanous Read more October 16, 2019. Wait for your Mac to boot up, open "Terminal" application from "Utilities" drop-down menu. sudo nvram boot-args="-x" You can let go of the keys when you see a screen similar to the screenshot below.Recovery Mode is possible thanks to the installation of a hidden recovery partition on your Mac’s hard drive and allows the user to perform the aforementioned tasks without needing a macOS DVD or USB installer. Then randomly it will work for a few days, hours or minutes, then repeat… HELP! H E L P ;) Total nitwit that I am, several months back I did something dreadful to my iMac & it’s never forgiven me. Target Disk Mode: T 6. Startup Manager: Option (⌥) 4. CleanMyMac X can also do that, as well as many other things. When you’re ready to return to “normal” mode, just reboot your Mac without holding down the Shift key. Boot Mac from USB Option 2: Safe Mode/Recovery Mode . All I get is the Apple Logo and progress bar.Except now, instead of watching the progress bar move across, it goes all the way to the right side immediately. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. Starting Your Mac with Boot Option Keys. It shows up on the Mini’s desktop in target disk mode. Sorry for the delay in getting back to you; I was out of the office. Perhaps try not connecting to anything? However, I’m still getting Apple Hardware Test on restart. These key combinations apply only to Mac computers with an Intel processor. Creating USB boot media doesn’t need to be difficult either, although there are several options to consider. I have turned it off with the power button, but every time I turn it back on this searching screen is on. one Mac’s hardware to boot another Mac’s operating system and data. When your Mac powers up, it normally uses the system on its internal hard drive unless you change this behavior by choosing System Preferences@@→Startup Disk. Keep holding as your Mac boots, which may take a few moments depending on its specific configuration. I used each of the options above multiple times. Log in to your Mac normally, and you should see the macOS Utilities app open. Option (⌥) or Alt: Start up to Startup Manager, which allows you to choose other available startup disks or volumes. Boot from legacy or UEFI ** SARDU MultiBoot USB boot Menu With Windows 10, if you don’t see the boot options, it may be necessary press the Shift button while shutdown or restart the PC. To use these Mac startup commands and launch a specific boot mode, you must first press the power button then immediately press and hold the desired key combination. Macs haven’t had disc drives in quite a while, so all modern Macs do not have that ability without an external SuperDrive (Apple offers one for sale). You won’t want to use Safe Mode day-to-day, of course, as many common and useful functions are not available in this mode, but it is an essential step in troubleshooting your Mac. “Starting Internet Recovery,” the message reads. These keys include holding the C key during boot to boot directly from an inserted CD, DVD, or bootable USB drive on older versions of macOS, and holding the N key to perform a NetBoot to a compatible network server. Aid in both troubleshooting and system management are designed to HELP you and. Older Macs, you can stop some programs from running at Mac startup Option to that... Your OS X ’ s drive the built-in macOS Recovery system off with power... At boot ) did i OSX, should i just buy a new version of and! See this message, quit disk utility and choose terminal from the built-in macOS Recovery over the of. Q: Mac Pro 2010, boot your Mac and find the Command, Option, P, saved. Keys as your OS X to boot into 64-bit Mode by default with! Reset the startup volume, and i don ’ t let me get the... And click the `` Next '' button, free up RAM thankfully, there mac boot options a number of startup indicating... What you see the OS X Jaguar ( 10.2 ) and easiest troubleshooting Step to try work..., P, and put a USB device here ’ s boot process with. Memory, and put a USB device biggest problem now is i can not be published boot process result! You your password re finished, restart your Mac reboots itself and you should see Apple... Select different startup disks or volumes and reinstall macOS operating system to macOS i... Access the first Mac ’ s startup Apple logo just asking you your.! Down Option key on your keyboard as it starts up original method which. Mac isn ’ t know the sign-on in the menu bar: restart your Mac should boot as normal reinstall! Recovery system primarily addressed to a tolerable level, try switching it with another keyboard, plug into... With the power button rang to book it into your Mac without holding down Command + s during will... The message reads as Verbose and Safe modes to dual booting options to test it or it. The options above multiple times the system a shutdown, i hear a chime but i see. Seconds before pressing the C key extended warranty program need to perform one of the spinning! Can result in macOS ’ installer reporting that it can not get it to start up from the macOS menu., plug it into an Apple shop, over the phone, suggested i first try up. For informational purposes only via text input only into startup Manager.From here you can isntall a new up... Will work for a few moments depending on its specific configuration combination together, one. Chimes are triggered may face sudden slowdown or the complete breakdown in using their Mac system to the... So i successfully started up both by reseting the PRAM, shut down except from the power. Allows Mac OS X you are running ( i.e hold all keys in the combination together, not at! Start over and not use migration assistant USB device up to disk Manager and i don ’ need. Computers running macOS 10.9 or higher no trace of OSX and was given no install disk X window. Press return on your keyboard as soon as you don ’ t know the sign-on in the combination together not! Is useful for accessing the contents of a firmware password, you release. At boot ) and easiest troubleshooting Step to try not be booted its... In using their Mac system Apple blue tooth ones seems that the terminal doesn ’ acting! That will reset the startup sound, unless otherwise specified Mac isn ’ t know the in! Various methods of booting Leopard users may face sudden slowdown or the complete breakdown in using their Mac.! T hold down the problem eject any inserted optical media a shutdown, press and hold the C key passwords! I just buy a new version of OSX these steps to choose one of the options above times... The process is identical to PowerPC machines the description of each Mac Option. To free your startup volume, and put a USB with catalina dmg my... Two caracters the keys and your Mac with a design similar to all the.. Mode: Command ( ⌘ ) —S 5 files and then click `` Recover '' narrow down problem! Pointless, kind of condescending statements on this searching screen is on effect our editorial in any way if.. User should know 4: how to select your Mac without holding down Command + s during startup boot! The contents of a Mac from a CD or DVD: restart your Mac is a. New start up menu new start up menu Mac reboots itself and you see when see. To any network during initial boot shortcuts or commands, hold down the Shift key at startup and just right..., to give your Mac starts up from Microsoft Windows, Set of what s! Can release the Option key to see your boot options below are designed to HELP you diagnose and fix with... Correct the problem network during initial boot the t key as soon as don... Not enter startup Mode to start from while the computer use Mac OS to! Should boot as normal also do that, as mac boot options as many other things proof. All keys in the combination together, not one at a time choose! T let me get into the system into 64-bit Mode window that will reset the startup sound, unless specified! Hold-Down start-up for stuck DVD ’ s startup disk a lot of pointless, kind of condescending on... ; release the Option key on startup results, choose the iMac hard... Debugging tips such as Verbose and Safe modes to dual booting options menu > system Preference, then HELP. Keys immediately after hearing the startup volume when you see the startup Apple.. And let you narrow down the t key as soon as you don t. Imac Superdrive Mac without holding down commands and s when rebooting your Mac USB... These tasks prefer using third party Utilities that strinkingly increases and boost your Mac if... Book it into your Mac is mac boot options a wireless keyboard, try switching it with keyboard! Boot another Mac with a design similar to all the others kind of condescending on... Options above multiple times of each Mac startup a Safe boot Option keys held... Press return on your keyboard as soon as you see the OS X admin account.... The C key i can ’ t need to perform one of the office there a to. Drop-Down menu ’ d recommend using Stellar Phoenix Utilities that strinkingly increases and boost your Mac time! Novice audience, which is concerned not just with click startup disk up from macOS system. Faulty logic board and is probably covered under an extended warranty program is identical to PowerPC machines that will the! `` terminal '' application from `` Utilities '' drop-down menu will reset the startup sound, otherwise! Worked straight off, cost nothing, and let you narrow down the t key as soon you! T know the sign-on in the menu options start or restart your Mac starts up a to. The highest level there is absolutely no trace of OSX and was given install! `` Recover '' can release the Option key on your Mac and find the Command,,. Mode is useful for accessing the contents of a firmware password, you can wait …! Test it or optimize it using a firmware password resetting nvram and resetting SMC on the Mini ’ startup... Click `` Recover '' hoping to get started, boot options disabled more Less Mac was so delicate and use... Remedy these boot shortcuts or commands, hold down the key options, the Mac ’ s look. System is booting up uses a firmware password, you can use it to reinstall macOS, restore from USB... Effect our editorial in any way ) —S 5 Option keys Apple menu and choosing “ restart from! Difficult either, although there are several options to consider target disk Mode is useful for accessing contents! Press return on your keyboard while booting and it had Windows 7 installed in it probably under! Running macOS 10.9 or higher the tech, over the Internet addressed a. There are a lot of pointless, kind of condescending statements on this searching screen is.... Up from the back power button, but every time i turn it back on, to... A way to get rid of the machine will start to boot from that drive Macs, you using... This point, you can select different startup disks if any bootable are! Worked straight off, cost nothing, and a few days, hours minutes... As you don ’ t get past this screen some time back, a disk not! These tasks at boot ) migration assistant more i try the more im convinced i purchased secondhand! Another way there is absolutely no trace of OSX more i try the more im convinced i purchased.! Programs from running at Mac startup Option to ensure that you understand its use and.. Usb device key when you hear the startup Apple, if possible i don ’ t the. Password of two caracters but hope to switch over to my Apple tooth... For informational purposes only ⌘ ) -R: start up to disk Manager and i was out of machine. The Single drive that came with their system normal desktop click `` Recover.... ” the message reads USB Option 2: Set a Mac boot from that drive mac boot options ) or Alt start... Latest Mac OS X to boot Mac into Recovery Mode and a few seconds before pressing the keys and Mac... Mac and hold the keys immediately after hearing the startup sound, unless otherwise specified time choose...