Right, so I was working on my old computer yesterday evening and suddenly it re-started automatically. Then, when it turned back on after a few minutes I got a blue screen and a huge error of which I could only read the first 3 words in a hurry as the screen was there for a few seconds only! The words were 'One of the display adapters..." The computer then just shutdown and now it's not working any more. If I switch it on there is power, the fans are spinning but there is absolutely no signal to the monitor. Any ideas on what has gone wrong?