Ok so I think my PCI-E slots might me dead. I got my new PC and when I put my 8800gts in the monitor says no signal. So I tried my old 7900 out of my old PC thinking the 8800 was DOA. same thing. Its not the monitor because it works with other computers. So I'm thinking its the PCI slots.I tried it in all 3 none worked. But I noticed that the fan on the card is spinning. Is there a way to tell if they are dead for-sure? Could this be something else?
Did you plug in the auxillary 12v power connectors from the psu to the 8800 video cards? Could be a number of things, but likely not bad PCIE slots. I would reset the CMOS jumper and default the BIOS. Upgrading to the latest BIOS might solve the problem too.