I just got my dads computer, and its a nice one. But it has a SiS 8 mb Video Card. So I bought a new one, ATI Radeon 9200 128 MB AGP card 8x/4x. The card works, I have tested it in two computers. I replaced the old card and put the new one in the AGP slot, firmly. I hook my cp back up and turn it on and the monitor won't come one, doesn't even boot up. I have tried installing the drivers that came with it before hand, and even downloaded the latest Catalyst off ATI. Nothing works. I have no exhisting Video card drivers on my computer, atleast its not registering under addd/remove. I have nearly given up. Please help me.