Wow, this must be a trend at the moment or summit. My son's PC with an ASUS P5B-E mobo just died the same death as well. I thought it was just the PCI-e slot, so I purchased an FX5500 PCI VGA & still nothing. I went through everything because I couldn't believe that the board just died, but that's precisely what it did.
Since your board has been sitting, have you considered maybe the CMOS battery could have died?
If that didn't take care of it even after clearing the BIOS (assuming you have), it's probably DOA