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nico_apple Author

Level 1

4 points

purple screen imac

My iMac screen turn purple out of standby mode or screensaver. any idea? Thanks!

iMac 21.5" 4K, 10.14

Posted on Feb 17, 2019 2:13 AM

Top-ranking reply

rkaufmann87

Level 10

143,856 points

Posted on Feb 17, 2019 7:52 AM

It appears to be a failed GPU. Before taking it to your local Apple Store or Apple Authorized Service Provider to be diagnosed and repaired try some basic resets.

Use safe mode to isolate issues with your Mac - Apple Support

How to reset NVRAM on your Mac

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3 replies

Top-ranking reply

rkaufmann87

Level 10

143,856 points

Feb 17, 2019 7:52 AM in response to nico_apple

It appears to be a failed GPU. Before taking it to your local Apple Store or Apple Authorized Service Provider to be diagnosed and repaired try some basic resets.

Use safe mode to isolate issues with your Mac - Apple Support

How to reset NVRAM on your Mac

den.thed

Level 10

82,360 points

Feb 17, 2019 8:46 AM in response to nico_apple

Good advise there from rk87.

In addition, I would try disabling the Screensaver, Nightshades, Motion and Transparency to see if any of those or a combination of those is causing the problem.

macjack

Level 10

111,204 points

Feb 17, 2019 8:53 AM in response to nico_apple

Go to System Preferences > Accessibility > Display and uncheck Invert Colors.

EDIT: (Actually I don't think it's that)

purple screen imac