I uninstalled my nvidia card, inserted my ati card and installed the drivers from the CD. I got columns of flickering horisontal lines all over the screen and there's obviously something wrong (games don't work etc). Then I figured out I needed to use driver cleaner so I cleaned up the nvidia drivers and I also installed the new drivers from the ati site, but this only made it worse. A few seconds after entering windows I get "dropping of physical memory" and something about an error with ATIdvag2. And that was when I made my genious move and changed some settings in my bios and now my screen is black... I think I switched some display settings from PCIe to some integrated motherboard ****. Well, so I'm finding it kind of hard to fix anything with a black screen. Suggestions?