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My iMac has recently crashed and restarted and now I have vertical stripes on the screen
[Re-Titled by Moderator]
iMac 21.5″, macOS 10.15
Try booting in safe mode How to use safe mode on your Mac - Apple Support
Try booting in safe mode How to use safe mode on your Mac - Apple Support
Take a screen shot & view that in Preview, move the Preview window around, if you see double lines it's a Video card/VRAM problem, if the lines do not move moving the pic around then it's the LCD or cable.
Have you blown the dust out of the intakes lately?
What temperatures does this App report? Especially the GPU.
This App can be used to speed up the fans, all my iMacs would be dead without it.
Never ever ever drop fan speeds below the speed that the Mac itself is calling for.
MacFansControl…
iMac has recently crashed and restarted and now I have vertical stripes on the screen
