motherboard - Black Screen when Computer Boots

I'm having a serious problem with my computer; I think I've narrowed it down to the motherboard, but I'd like a second opinion before I spend the money. I have no idea what's wrong.

Before I moved into my new apartment, my desktop was working fine; now, it just won't work. It will turn on, the fans will spin up, lights come on... but nothing appears on the screen. No POST, nothing. I've tried:

• A different monitor (both are VGA)


• A different video-card (both are DVI, PCIe)


• Three different, known-good VGA->DVI adapters


• The onboard video port (VGA)


• Reseating the memory, and trying only one stick


• Different, known-good wall-outlets


• Unplugging the HDD and CD-drive from both the motherboard and PSU


• Replacing the PSU


• Replacing the motherboard


• Taking the motherboard out and running it on a piece of cardboard

Has anyone had this happen before? Any advice!?

Here are my specs:

• A13G+ V3.0 motherboard


• 2 2-gig 800mhz DDR2


• 600-watt PSU


• two older Geforce video cards

Answer

Having had this happen to me recently - if the fans turn but there's no beeps even when you remove all the memory modules then it's the motherboard that dead.

The fact that the on-board video doesn't work would lend more support to this theory too.