By the way, just to eliminate a possible hardware conflict, I have in one of my systems that CPU and motherboard, and for a short time, tried that video card. I was debugging why my 9500 wouldn' work in another system, and the only conclusion I came to was that either the card was bad or incompatable with my other motherboard (MSI K7N something), as it worked in the ASUS A7V333. If your format the hard drive with XP2000 or XP, and do everything right and it still doesn't work, then it is a bad card IMO.
Edit ditto pelikan, a 300 wat generic could VERY well be your problem. An Antec 300 or better is recommended. Do you have a local store where you could buy an Antec and return it for no restocking fee ? If so try that, and if it fixes the problem, keep it, and if not, (keep it anyway) decide what to do. See above paragraph; PSU and/or a bad OS install need to be tried one at a time, and the OS re-install is free (assuming no data loss), where as the PSU upgrade costs.