Ok... I'll try to explain all the problems i'm having with my iMac. First, my iMac is a Intel Core Duo 20" iMac with 1 GB of Memory. I bought this iMac in July 2006. This problem started in September 2007, so the computer wasn't under warranty anymore. The problem started when lines started to appear in the screen, as you can see in one of the pictures (1.jpg) i'm attaching. Then all sort of weird graphics and colors started to appear as you can see in some of the other pictures attached. But that's not all, the computer freezes all the time, 5+ a day, so I did a clean Tiger install, and still the same problem, then I bought Leopard, doing a erase all and install and still the same problem. I live in Paraguay and took the computer to the authorized service and it seems they don't have a clue, they said it MIGHT be the screen, (over $800 fixing) but I don't see any relation between the computer freezing all the time and the screen. any clues?? I really need HELP with this computer! It is unusable!