The monitor works because I can see the 'No Signal Input' splash screen. The cable hasn't been moved since it worked five minutes ago and the connections are secure but I get no display. There might be a BSOD that I can't see, something about the way the picture died reminded me of what happens when a BSOD occurs.

I'm going to try booting in Safe Mode and turning off driver signing because my hunch (a technical term) is that driver signing is something to do with it. Anyone got any other bright ideas?

Thanks - rev