GeForce 8800GS (Alpha Dog Series) installed , now computer won't power up

[Dagnabbit]

I have an older tower with an ASUS A8N-E motherboard, an AMD Athalon 64 Dual Core processor, and 2GB of ram. I currently have an ATI Radeon X800XL graphics card installed which works okay.

I am trying to upgrade to a GeForce 8800GS graphics card that I have had laying around for awhile, but when I install it the power supply appears to crowbar (fans spin for less than 1 second then shut down and I have to reset the power supply). I purchased a VisionTek VT500psu power supply believing that the old 400 watt PS just didn't have enough power. But still have the same problem.

I don't have another tower to test it in, but I don't believe the card is bad.

All of the documentation I can find on the motherboard indicates that it should be compatible with the 8800 card. The PCI Express V2 slot works fine with the old X800 card and the 6 pin molex connector connects with no problem. What am I missing?

Thanks for any help you can provide.

 

[hang-the-9]

Sounds like a power issue, but the 8800 series quite often fail (usually overheating and cooking the chip). I'd test the card with another system before going any further with trouble-shooting.

BIOS update may help, there may be an issue with the PCIe revision on the old motherboard.