Crash; shutdown

[Perry Hutchison]

> So I got up and walked away from my computer this afternoon, and
> came back to find it in the middle of shutting down.  No good
> reason, no crash dump (yes, they're configured) no nothing, just
> this:
>
> Sep 19 18:14:53 colossus syslogd: exiting on signal 15
>
> At this point, everything sync'd up and the system shut down, 
> completely, and powered off.
>
> I've had it suggested that this could be a power supply going
> south.  Any other ideas?

Any chance someone hit CtrlAltDel on the keyboard?