About half-a-dozen times over the past few months I have a workstation whose screen has flashed black and blue, then flashed up the blue screen of death with various dumps -- that went away after a while followed by the "Start Windows Normally" option screen, and after some period of time does come back up again. There seems to be no correlation with activity. I could be working on Word, or in a browser (firefox) or both. The system is an HP OEM Windows 7. I've scanned for malware with 3 different programs and nothing found.
Is this symptomatic of anything?