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To use any of these key combinations, press and hold the keys immediately after pressing the power button to turn on your Mac, or immediately after your Mac begins to restart. Keep holding until the described behavior occurs.
If your Mac is using a firmware password, all of these key combinations are disabled, except as noted below.
Command (⌘)-R: Start up from the built-in macOS Recovery system. Or use Option-Command-R or Shift-Option-Command-R to start up from macOS Recovery over the Internet. macOS Recovery installs different versions of macOS, depending on the key combination you use while starting up. If your Mac is using a firmware password, you're asked to enter the password.
Option (⌥): Start up to Startup Manager, which allows you to choose other startup disks or volumes, if available. If your Mac is using a firmware password, you're asked to enter the password.
Option-Command-P-R:Reset NVRAM or PRAM. If your Mac is using a firmware password, it ignores this key combination or starts up from macOS Recovery.
MAC®5500/MAC®5500HD RestingECGAnalysisSystem Operator'sManual SoftwareVersion-016RevisionA MAC®5500/MAC®5500HD RestingECGAnalysisSystem English 2010GeneralElectricCompany. Help Center - MiniTool iOS Mobile Recovery for Windows. Outline MiniTool Mobile Recovery for iOS is a piece of data recovery software for iOS devices, such as iPhone, iPad and iPod touch. This software can recover deleted data, like photos, messages, contacts, call history and notes. Mac Recovery Mode is a dedicated partition of the disk that contains a recovery image and an OS X installer duplicate. It is a multifunctional inbuilt Mac utility that enables Mac users safely recover or restore their data from Time Machine, fix or wipe their hard disk, access online help and even to reinstall macOS. Feb 15, 2019 If you used Time Machine to create a backup of your Mac, you can restore your files from that backup.You might want to do so after the original files are deleted from your Mac, or the hard disk (or SSD) in your Mac is erased or replaced, such as during a repair.
Shift (⇧): Start up in safe mode.
D: Start up from the built-in Apple Hardware Test or Apple Diagnostics utility, depending on your Mac model. Or use Option-Dto start up from this utility over the Internet.
N: Start up from a NetBoot server, if your Mac supports network startup volumes. To use the default boot image on the server, hold down Option-N instead.
Command-S: Start up in single-user mode. This key combination requires macOS High Sierra or earlier.
T: Start up in target disk mode.
Command-V: Start up in verbose mode.
Eject (⏏) or F12 or mouse button or trackpad button: Eject removable media, such as an optical disc.
Learn more
- Learn what to do if your Mac doesn't turn on.
- Learn about Mac keyboard shortcuts that you can use after your Mac has started up.
What is Mac Recovery Mode?
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Apple recovery mode is available in an emergency when your macOS is running into serious difficulties. There are four main features of Mac’s Recovery Mode, whether that is the regular recovery or internet recovery:
- Restore from Time Machine Backup: Use a previous version of your Mac stored on an external drive. You will have had to prepare this is in advance by connecting an external hard drive and using Time Machine to copy all of your data, including files, OS, and settings. If you have an external copy, you can use this to restore your data under the ‘Restore from Time Machine Backup’ in Recovery Mode, which will erase the current disk.
- Reinstall macOS: This wipes your current OS and its data and replaces it with a clean version. If you have any files you need saving, make sure that they’ve been uploaded to the iCloud or some other storage, whether online or on a separate hard drive. Which version of macOS that is reinstalled may depend on whether you run the normal Recovery Mode or Internet Recovery Mode.
- Get Help Online: Recovery Mode allows you to use Safari to troubleshoot issues you may be experiencing.
- Disk Utility: If you suspect there’s something wrong with your drives, you can scan, verify, and repair them from the recovery screen, which might be a quicker and more convenient alternative than erasing and reinstalling your macOS.
Now, if you are considering a complete restart in Recovery or Internet Mode, it’s recommended that you give your Mac a thorough clean first. Otherwise, this is like cleaning the house, then dumping everything you’ve hoovered back onto the carpet. The muck has only been moved around. With a tool like CleanMyMac X, you can declutter everything you don’t need, then back up safely (always best doing before restarting or rebooting), which means it should run much faster once restored to full working condition. By the way, this app removes up to 74 GB of junk on an average Mac computer. So, give it a try — you can download CleanMyMac X for free.
The differences between Internet Recovery and regular Recovery
Normal Recovery Mode accesses Recovery HD, an emergency cache of essential utilities that is saved to a partition in your Mac's startup drive, meaning that it’s kept separate from the rest of your disk space.
Because it’s been partitioned from the rest of your disk space, the data can’t be cleared in cleanup scans or manually deleted. It’s small (650MB) so it won’t affect your Macs performance, but it may be useful if something goes wrong.
If you do need to reinstall your macOS, Recovery Mode will reboot with the most recent version that has been installed on the computer.
Internet Recovery, however, can only reinstall the version of macOS that was originally on your computer when it was new from the box, which likely won’t be the most up-to-date version. This is because Internet Recovery uses code embedded into your Mac that includes an image for the appropriate OS. When you begin Internet Recovery, the image is transmitted to the Apple servers to request the correct codes for reinstallation.
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Booting from Internet Recovery takes much longer than a normal partition-based recovery and, naturally, requires an internet connection, so ensure your connection is stable and that you have adequate power (keep your Mac charged).
When to use Internet Recovery
If your Mac has been unable to create a partition for the Recovery HD, you will not be able to use normal Recovery Mode. This might be because you’re using a RAID volume, which doesn’t support the recovery partition, or your drive has been partitioned with Boot Camp Assistant and subsequently modified.
Your Mac may have successfully created the Recovery HD partition but Recovery Mode may not be able to access it. This might be due to damage to the drive or a more serious error in your system.
If your computer is unable to access normal Recovery Mode, it will automatically begin Internet Recovery. If you have a working recovery partition, you will not be able to access internet Recovery Mode.
How to enter Recovery Mode on Mac
Hopefully, you’ll never have to use either the normal or internet Recovery Mode for your Mac, but if you do it’s simple to access. For both recovery modes, you will need enough power to see you through the process as well as your Apple ID to reinstall macOS.
1. To start your Mac in Recovery Mode, first, if your Mac is turned off, switch it on. If you’re currently using it, hit Restart. You can only use Recovery Mode from the startup drive.
2. As soon as you hear the startup chime, hold Command (?) + R.
You will need to hold the keys until a new screen appears.
3. If you have a working recovery partition, you will enter the normal Recovery Mode. The macOS Utilities window appears, which will list the four options to recover your Mac (Restore, Reinstall, Get Help, and Disk Utility). Select Reinstall macOS.
From there, your Mac will be cleared and rebooted with the latest version of macOS that had been installed on it.
How to access Internet Recovery Mode
1. Turn on your Mac or restart it as with normal Recovery Mode. As soon as you hear the startup chime, press and hold Command (?) + Option (?) + R.
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If your normal Recovery Mode isn’t available, pressing Command (?) + R should automatically redirect you to Internet Recovery mode.
2. After a few seconds, a globe will appear onscreen with the text: Starting Internet Recovery. This may take a while.
Note: This is your computer entering internet Recovery Mode; it is not yet reinstalling OS X.
3. You will then be given a network list to choose your internet connection for the download. Press the check mark to continue or hit Enter once you have selected your network.
4. You will be asked to resubmit the network password even if you have previously connected to it, so make sure you have it available. Hit Enter or the check mark symbol to continue.
5. The screen will then show the image of a globe again, as well as a status bar. This is your computer sending the information about its original state to Apple to request the appropriate drivers and may take some time depending on your internet connection.
6. Once complete, you will see the same Utilities screen as the regular Recovery Mode, which gives you the same options to restore your system.
Mac Recovery Mode: A last resort
It is always worthwhile to run a Disk Utility scan if possible before reinstalling your macOS. It’s even better to keep your Mac maintained with regular scans for issues that can accumulate to cause problems. Give your Mac a complete tidy up before restarting in Recovery Mode. Clean out the junk, declutter and restore your beloved Mac to full health.
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Caches and system junk quickly build up to clog your system and cause performance problems that might lead you to believe you need to reinstall your macOS, when really all it needs is a thorough clean-out. CleanMyMac X has cleared 737 million GB of junk files that wear down your system and uninstalled 10.5 million unnecessary applications and their forgotten extensions.
CleanMyMac X can also run diagnostics without entering either Mac Recovery Mode, meaning you can fix operating issues before you need to initiate a full reinstall.
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Get CleanMyMac X to improve the longterm performance of your Mac!