That doesn't sound promising mate.
Maybe one of the cards has gone? Could you try swapping them over?
You do have two cards don't you or did i just make that up?
Just the one card.
Swapped over to DVI and it now get past the splash screen into a sea of BSOD's
Codes 0FC and 07E, its also spouting something about HDAudioBUS.sys...
Edit: little googling shows it could be a harsh Trojan