I have a Gainward Geforce 4 Ti4200 Ultra/650 64mb graphics card, and its been working fine. But lately I have been getting a really annoying problem. At least once every day, the graphics seem to become all corrupted, with multicoloured lines all over the screen, running vertically from top to bottom, freezing the computer and making it restart. On a coplue of occasions I have got small multicoloured squares all over the screen, but it doesn't freeze straight away when this happens, it freezes about 30 seconds later, and then restarts. The thing that was worrying me, was that when I get the corrupted lines, and the computer restarts, it doesn't go away. I still have the corrupted lines until I hit the power button and switch it off. When I switch it back on again, they have gone. I only got this card about 5 months ago.