Before doing anything more drastic, let's try first resetting the System Management Controller (SMC).
Macline
- Shut down the computer.
- Unplug the computer's power cord and ALL peripherals.
- Wait 15 seconds.
- Attach the computers power cable.
- Wait another 5 seconds and press the power button to turn on the computer.
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If that doesn't work, try resetting the PRAM. (Be aware that resetting the PRAM will probably mean that you'll have to reset some of your preferences afterwards.)
- Shut down the computer.
- Locate the following keys on the keyboard: Command, Option, P, and R. You will need to hold these keys down simultaneously in step 4.
- Turn on the computer.
- Press and hold the Command-Option-P-R keys. You must press this key combination before the gray screen appears.
- Hold the keys down until the computer restarts and you hear the startup sound for the second time.
- Release the keys.
If none of this works, I'd recommend having the computer evaluated by an Apple Authorized Service Provider. You'll find them here: https://locate.apple.com/
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Feb 26, 2018 5:25 AM