10 mins ago I updated my M mobo BIOS and rebooted and same thing happened to me. No screen at all.
Worst case scenario would be my BIOS chip would need to be replaced I guess.
I used the 4-in-1 drivers too.
Did you update your BIOS also?
I got the bios from these forums. It was called 'test.bin'. I also saved my old BIOS but I dont see how that could do any good if i cant get into the pc at all.