Q: big yellowish vertical stripes at startup
At start up from my IMac (OS el Capitan) I had today big yellowish vertical stripes going over in small blue stripes. after that the computer is trying tostart up again without my interference.
Now it is werking properly again.
Has anybodt an idea what is happening?
iMac
Posted on Dec 31, 2015 4:30 AM
Community Specialists
Hi phiillip1,
Thanks for using the Apple Support Communities. I'm sorry to hear you had this issue with your iMac, but am glad to hear that it appears to be working correctly at the moment. If this graphical distortion issue returns or reoccurs, you may find some of the troubleshooting steps outlined in following article helpful, up to and including contacting Apple Support if necessary:
(Note: While the article is aimed at external displays, a number of the steps should apply for built-in displays as well)
Get help with video issues on external displays connected to your Mac - Apple Support
Regards
Posted on Jan 1, 2016 1:29 PM