I've scoured the internet looking for an explanation but can't find anything.
It was working perfectly well, closed the cover, opened it again five minutes later and only grey screen.
Graphics are fine until log in screen and then everything is grey, I can hear the start up sounds though.
Booted it in safe mode and played around with resolution settings but didn't get much further than that. Got the screen replaced on it a few weeks back but no new software or issues with the new screen.
It's an HP Pavilion Entertainment PC running windows 7.