I've been out of town for a few days. Is the machine still up? Whether anything got logged depends upon what machine it is, which we never discussed. Anyway, if it's still up it was probably just over heated from dust. If not, and there's no log entry, the power supply is the primary suspect but generally when they go bad they stay bad. There's a little fuse inside the power supply box, not designed to be easily replaced, which generally blows before all the smoke comes out.