Apple Watch Hangs When Turned On
Why are they needed and when to use them.
Typically, a Mac runs smoothly. However, anyone may run into a problem that prevents OS X from loading.
The system has a whole set of tools for emergency computer start-up, system recovery, and specific startup methods for non-standard situations. Let’s take a closer look at all the possible options for booting a Mac.
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Most modern Macs support over 10 ways to start the system. To get into any of them, you need to hold down a specific button or key combination immediately after the start sound when you turn on the power.
1. Recovery mode
Why do I need: In recovery mode, a disk utility, OS X installer, and a recovery service from a Time Machine backup are available. You need to boot in this mode if the system does not start in the usual way, to restore it from backup or to completely reinstall it.
How to get: clamp the combination Command (⌘) R after a sound signal that the computer starts to turn on until the boot indicator appears.
2. Startup Manager
Why do I need: if the second system on Mac is running Windows, then in this menu you can choose whether to boot into OS X or into Window.
How to get: hold the button Option (⌥) or point the Apple Remote previously paired with it on your Mac and hold down the button Menu.
3. Download from CD / DVD
Why do I need: Intel-based Mac computers with an optical drive or with an external CD / DVD drive connected can be loaded from disk. If you have the OS X distribution on the disk, you can install the operating system.
How to get: clamp FROM.
4. External drive mode
Why do I need: any Mac with a FireWire or Thunderbolt port can be used as an external drive for another Mac to transfer large amounts of data between computers or expand the drive on a second computer.
How to get: first you need to go into Settings. Boot Volume and activate External drive mode. After that, while loading, hold down the button T.
If you don’t want to risk the data on your Mac’s drive, choose a capacious and fast flash drive.
5. Safe mode
Why do I need: safe mode allows you to eliminate problems that occur during normal OS X boot. When the system starts, the drive will be checked for integrity and only the most necessary system components will be launched. If third-party applications led to errors during startup, the system will boot without problems.
We use this mode when it crashes and freezes when OS X boots up. If the Mac boots into it, we begin to disable the automatic loading of applications that run with the system.
How to get: clamp Shift (⇧).
6. Network recovery mode
Why do I need: This mode is similar to the previous one, but allows you to restore the system from the distribution downloaded from the Apple server. To do this, you need to connect to a network with Internet access. Use this mode if the area of the disk for normal recovery is damaged.
How to get: use a combination Command (⌘) Option (⌥) R.
To save data and be able to recover from a backup will help specialized devices from Apple.
7. Reset PRAM / NVRAM
Why do I need: In a special section of the Mac’s memory, certain parameters are stored (speaker volume settings, screen resolution, boot volume selection and information about the latest critical errors). If errors occur that may be associated with these settings, you should reset them.
How to get: after the beep Command Option P R. Hold the keys until the computer restarts and you hear a download signal a second time.
8. Diagnostic mode
Why do I need: This mode is intended for testing Mac hardware components. It will help identify the cause of the computer malfunction. If there is a suspicion of a malfunction of the components of the Mac. boot and check.
How to get: hold the button D.
9. Network diagnostic mode
Why do I need: like the previous mode, it is designed to test the hardware stuffing. However, if your Mac has problems with your hard drive or SSD, network mode will download everything you need for testing from the Apple server.
How to get: press shortcut Option (⌥) D.
10. Download from NetBoot server
Why do I need: in this mode, you can install or restore the operating system over the network. To do this, you need a ready-made disk image that is stored on a server accessible over the network.
How to get: just hold the button N.
11. Single-user mode
Why do I need: In this mode, only the command line will be available. This should only be booted if you have experience working with UNIX commands. Advanced users will be able to perform computer maintenance and troubleshoot system problems.
How to get: press the combination Command (⌘) S.
12. Detailed logging mode
Why do I need: This mode is no different from the standard Mac download. However, during system startup, instead of the usual indicator, you will see a detailed system startup protocol. This may be necessary in order to understand on which OS loading process an error or malfunction occurs. Please note that this mode is aimed at advanced users.
How to get: press the combination Command (⌘) V.
13. Reset System Management Controller (SMC)
Why do I need: Such a reset should be applied in the presence of system errors that do not disappear after a system reboot and turning off / on the computer. The following is a list of such problems in which Apple recommends resetting the controller:
- causeless rotation of computer fans at high speeds (when the Mac is idle);
- improper operation of the keyboard backlight;
- incorrect operation of the power indicator;
- the battery indicator is not working correctly on the laptop;
- display backlight is not adjustable or is not adjusted correctly;
- Mac does not respond to a power button press;
- the laptop does not respond correctly to opening and closing the lid;
- the computer switches to sleep mode on its own;
- having trouble charging the battery;
- The MagSafe port LED does not correctly display the current mode of operation;
- applications do not work correctly or freeze at startup;
- Errors occur when working with an external display.
How to get: On different Macs, this reset is done in excellent ways.
On stationary computers:
- 1. Turn off the computer.
- 2. Disconnect the power cable.
- 3. Wait 15 seconds.
- 4. Plug in the power cable.
- 5. Wait 5 seconds and press the power button.
On laptops with a non-removable battery:
- 1. Turn off the computer.
- 2. Connect to power using the adapter through MagSafe or USB-C.
- 3. Clamp combination Shift control option on the keyboard on the left and, without releasing them, press the power button.
- 4. Release the keys and press the power button again.
On laptops with a removable battery:
- 1. Turn off the computer.
- 2. Disconnect the power adapter.
- 3. Remove the battery.
- 4. Press the power button and hold it for 5 seconds.
- 5. Install the battery, connect the power adapter, and turn on the computer.
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