Was working fine.

Stopped booting.

Tried:

• Disconnected everything non-vital (all data cables/on board power cables out/pci-e hardware/usb etc.)
• Tried both DVI outs/tried pci-e video card.
• Unplugged/re-plugged all on board connectors.
• 4x memory modules - unplugged/replugged, tried 1x ram stick, tried different modules.

Remove ALL memory, and get 1-3-2 beeps.

Add memory, get no beeps.

Add a disk that should boot - minimal HDD activity.

Add a disk that probably wouldn't boot - HDD lights up for a while.

Any options? 

Thanks,

     John.