clubhous,
I looked on the web and the Code 94 - Shutdown condition 5 and could not find much information on it.
What is the Model of this system, older BIOS' may have a different meaning for 94.
The over voltage concerns me; it is certainly not within to +-10% tolerance. If you have a spare power supply, plug it in and see if the problem continues. It is conceivable that it is shutting itself down to protect itself.
Things I would try, new power supply, reset CMOS, reseat memory and switch sockets.
-Fred