What could cause this? Lines across the screen
Three machines in the last week have had this problem a couple of times, some can be used for hours before it occurs others have booted up and had the problem straight away, one computer also restarted itself after a few seconds with no signs of why in the event log.
I believe its called artifacting and related to overheating GPU? I had a simular experience with an old Xbox 360.
Its simular the images below, Im yet to get a picture of our screens but shall do if it happens again.