I have a computer that powers itself off intermittenly. It shuts down when I've been using it and walk away for a few minutes. The shutdown may take place anywhere from 5 to 30 minutes after I've stopped using the pc. I went into event viewer and found dozens of critical errors. Can't remember the exact error message, but the "details" were something like "The computer had an unexpected shutdown, may be due to power loss, application error.........". The error listings had "kernel-power" or "power-kernel" in the source column. Is there any way to determine why the machine is powering itself off?