How do I reset my GMC Sierra?

Choose Apple menu > Restart, then immediately press and hold Command-R. In the Recovery app window, select Disk Utility, then click Continue. In Disk Utility, select the volume you want to erase in the sidebar, then click Erase in the toolbar.

How do I fix a stuck IMAC on loading screen?

If your Mac is stuck on this screen

1. Press and hold the power button on your Mac for up to 10 seconds, until your Mac turns off. (Every Mac has a power button.
2. Turn your Mac back on. If the issue persists, press and hold the power button until your Mac turns off.
3. Turn your Mac back on.

How do you reset the SMC on a Mac?

Here’s how to reset the SMC on notebooks with non-removable batteries:

1. Shut down your Mac.
2. Press and hold Shift, Control, and Option on the left side of the keyboard. At the same time, press the power button.
3. Hold for 10 seconds.
4. Release the keys and then turn on your Mac.

How do you fix a Mac that won’t boot or gets stuck on the loading bar?

Step 1: Restart the Mac first. Step 2: Press and Hold Command+ Options+ Shift+ R keys. Step 3: This will give the command to Mac to install the same OS that it originally came with. Step 4: After that, you restart your MacBook and it should solve the MacBook stuck at loading screen error.

Why does black screen of death occur?

The black screen of death is a fatal system error displayed by some versions of the Microsoft Windows operating system after encountering a critical system error which can cause the system to shut down.

Why are screens black?

The vast majority of color LCD screens are transmissive in design. This means they require a backlight to provide (generally white) light that is then allowed to pass through the pixels on the screen. These pixels are turned from transmissive (i.e. clear) to opaque (i.e. dark) in order to create the display you see.

How do you reset a Mac that won’t boot?

On a Mac laptop:

1. Shut down the MacBook.
2. Unplug and then reconnect the power cable.
3. Press Shift + Ctrl + Option/Alt keys and the power button at the same time.
4. Now release all those keys and the power button at the same time.
5. You may see the light on the power cable flicker.
6. Restart your MacBook.