Hi all! I'm having a problem with a Dell Optiplex GX280 at work. The problem is that when i turn the computer on sometimes it gets to the logon screen, and then the screen goes blank. When i eventually get to log on, I'll be doing something like typing out an email and the screen will go blank. But i still have power as I can hear the computers fans still spinning and also the keyboard num lock/caps lock lights are still on. I have tried swapping the monitor out but still no joy :-( Any ideas people?