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My computer starts- show Apple and progress bar then screen goes black / computer off after few seconds of progress bar

Computer turns on- Apple logo appears but screen goes black / shuts off after few seconds. Computer won’t stay on

iMac 21.5″, OS X 10.11

Posted on Dec 22, 2020 12:59 PM

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Question marked as Top-ranking reply

Posted on Dec 22, 2020 1:08 PM

First Reset SMC How to reset the SMC of your Mac - Apple Support

Reset NVRAM Reset NVRAM or PRAM on your Mac - Apple Support

Check if any of those options described by Apple can bring you some light If your Mac doesn't start up all the way - Apple Support

If your Mac doesn’t start up as expected - Apple Support

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Question marked as Top-ranking reply

My computer starts- show Apple and progress bar then screen goes black / computer off after few seconds of progress bar

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