Dark Jedi

The issue: computer went into stand by/hibernation and does not restart. The PS and CPU fans run, but there is no response from any I/O device (blank screen, no mouse/keyboard response, no drives open or make any sound, including HDD).

Some background: This computer was left on for several days over a vacation when I thought it was off. I returned to find it in stand by/hiberanation (do not recall the settings).
Moving the mouse/using keyboard keys do nothing (keyboard lights are on, both work on other machines, other keyboards/mice do not do anything on this machine).
CD/DVD drives do not open or respond, placing a diskette in the drive does nothing, placing a flashdrive in the USB port does nothing.
Screen is blank (except that it says it's working and to check the computer and/or connection - then it goes back to sleep). Another monitor just stays blank, this monitor works on another machine.
HDD LED is on steady, but HDD makes no sound (like all other devices).
The PS has no 1/0 switch, however, I can unplug the machine. If I unplug it, no matter how long, the fans simply start when I plug it back in and nothing responds.
Removing the battery does not help.
There were no storms, etc., during this time and the machine is connected to a good power surge protector. It was also not particularly warm during this period, the room probably remained in the low 70s.

Ideas?