Originally Posted by Bob32
The problem disappear, but it hasn't been solved so I'd like to know what to do if I ever face this situation again.
Intermittent problems are the hardest to solve, precisely because they are intermittent.
A couple of thoughts:
Take careful notes of any error messages when if it happens again and possibly screen shots.
Keep a digital camera nearby so you can take a picture of the screen quick like a bunny before the problem goes away again. (If so, it's a good idea to experiment to find out the camera settings that work best for taking pictures from the monitor.)
You might also check the Windows task manager and run a ps -A on the linux box to see whether the running processes look okay.
Just some thoughts.