What are the symptoms of a potential graphics card failure?
I am having issues where the mid-2011 iMac will crash when switching desktops, flash pixellated images at random locations on the screen, etc. I cannot do a screen capture on this since it will only capture what the screen should look like, and will not show the issue. I have uploaded two pictures of the display.
Any help appreciated.
iMac, macOS High Sierra (10.13.2), null