Last night I locked the screen on my Fedora 12 workstation. When I came in this AM, I only had a blue screen. The mouse worked but I couldn't unlock or access anything. In other words, just a blank blue screen. I rebooted. The machine goes through boot up ok until just after the Fedora logo appears. Then the system seems to freeze up. No keyboard input works, no mouse either. For a short while after boot up, the num lock key works and then stops responding. This happens every time I reboot now. The workstation does not seem to be overheating and the fans all work. Other than a nagios installation, there's nothing special about the config. Ideas?