I have a second computer that is an Asus A7V-133 running 1GB of PC133, AMD T'Bird @1.1ghz, Ti4400 and a Maxtor 30gig HD. It recently started showing artifacts in the display. Lines across the screen, green, blue dots appearing everywhere. The mouse would become unresponsive. The HD would begin to thrash. It was completey unstable. I have cleaned out the computer. Checked all fans. I even set up a small fan next to the computer for more ventilation as I thought it may be a heating problem. I even reinstalled XP Pro on it. Check Disk says that the HD is okay although Windows has told me a few times it couldn't load because of a Kernel problem, but I think that is a separate problem. Is the heatsink on my Ti4400 going bad? Do I have bad memory? I am really stumped on this one. Any help would be appreciated. Thanks.