Ok ya I have the same problem as you guys. I have a p4s800d-e Deluxe Motherboard with 3ghz, 2gb ram,1 harddrive, 1dvd,1cd with a 400watt Power Supply.
I'm thinking the power supply isn't good for my X800 256 DDR3 AGP 8X. I think I need more juice so I bought a 600w and will let you know if it works.
I know its not the card because it was tested on 2 other pcs with no problems but for some reason my monitor does not want to kick in. I also pulled all the power wires connecting to any other hardware on my pc that does not need to boot (fans,cd,dvd) still nothing. Hopefully this 600w will solve my problem, because I don't want to go Nvidia.
OH, and no it is not my agp slot because i'm running my ATI 9800 AIW pro 128 right now.
