I sure hope someone can help with this! I just brought a used computer (it's about a year old)These are some stats:
Amd Athlon x2 Dual Core 6000+
asus m2n-sli motherboard
asus geforce 8800gts 1gb
It needed a new psu. I took it into a tech store and they installed a new psu I had brought. Now the computer won't boot up while the graphics card is connected to the psu! If graphics card is disconnected the comp powers up! the guy put new graphics card into it and the same thing happened. So it's not that. He said psu was all good and hard drive is all good. He hasn't seen this problem before.