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gma29 Author

Level 1

4 points

my Mac doesn't turn on it displays a black screen with a few horizontal white bars

What could be wrong?

Posted on Nov 21, 2019 4:30 PM

Top-ranking reply

rkaufmann87

Level 10

144,102 points

Posted on Nov 21, 2019 4:32 PM

Difficult to say but it sounds like a failed GPU. Try resetting the NVRAM and if that does not take care of it then take it to your local AASP to be worked on.

Direction to NVRAM reset are in https://support.apple.com/en-us/HT204063

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my Mac doesn't turn on it displays a black screen with a few horizontal white bars

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