Mac air camera unavailable recovery method command-Option-P-R

2013-03-24 wcdj

During a QQ video chat, the camera was unavailable, including FaceTime. Restarting the computer did not help. Finally, Google found a solution. According to the reset officially provided by Apple
Pram and NVRAM methods, restart the computer again, enable the FaceTime camera function to restore normal (the reason is to be explored later ). This method can also improve the boot speed.

The procedure is as follows:

1. Turn off your computer.
2. On the keyboard, find the following buttons: Command, option, P, and R. You will need to press these keys at the same time in step 4.
3. Start the computer.
4. Hold down the command-Option-P-R key. You must press this key combination before the gray screen is displayed.
5. Press and hold the above key until the computer restarts and you will hear it again.
6. Release these keys.

Refer to "Reset Mac Pram and NVRAM" and "when to reset
NVRAM or pram "," Mac OS X: What is stored in pram ". When a Mac encounters an exception in power supply and hardware, consider resetting if it is not a trauma.