Hi,

I would try pressing the CUDA reset button on the 8500 (small grey button in a silver square mount just above the top PCI slot, see image below) and re-seating the processor card (You will have to remove the processor card in order to access the CUDA button).



If you're using a PCI video card, disconnect this and only use the onboard video. Also, if you have any other PCI cards installed remove these and try to boot.

If you make any progress on this let us know.

James.