Have you checked that the cable is solidly attached? Sounds stupid and obvious, I know, but I was experiencing something very similar just this very morning and it turned out that the DVI cable had managed to work itself loose to the point of almost being off altogether.

 

Neal 

Yes I have, I experience the same problem when I hook up my pc to a different monitor, using dvi-d or vga cords. My monitor self-tests correctly which indicates nothing is wrong with my monitor and the connections are sound, as the monitor recognizes it is connected to a computer, it is just behaving as if the computer is switched off and goes straight into 'power save' mode. I've spoken to a couple of technicians and the general consensus seems to be a video card failure, so I'm thinking of replacing it tomorrow. I was running nVidia 6800 which is getting on a bit these days so I need a new one anyway. I hope this will solve the problem -

i've had friends with similar issues and they have had to replace the whole motherboard, but as everything on the pc seems to be working fine (gets through POST ok) it seems unlikely.

 

Victor 

If you have a vga proble next to your dvi.If you do look for a blue connter.cheak and see on your monter.if so hock it up and see

 

Already have mate, same results, read the previous post.