I had an Amiga 600 which would work ok for the first 10 or so mintues, then the Amiga would start drawing funny colored lines and then get even worse. It would happen when it got hot and when it accessed the floppy drive. But I konw for sure that when I cooled it down, then it worked just fine. I never had the chance to repair the problem, but then I ended up bining it because the keys were long gone broken, the guts ripped out of it, and the casing gone... But no worries though, i will definately have another Amiga sometime.
