System freezing mystery

[jebsilver]

I have a workstation that is giving me fits. I recently rebuilt it with a new motherboard and processor. Since then, it freezes up and must be restarted. The freezes don't coorespond to any particular user action or program. I've even had it freeze while in the BIOS config screens.

So far I've tried:

replacing the hard drive
reinstalling windows
replacing the thermal paste with arctic silver
new video card
new power supply
disconnected cd rom drives
disconnected floppy drive
new mouse/keyboard
new memory
new heatsink

Just about everything in the case is new, except for the case itself. At this point I'm leaning towards a BIOS config issue. If anyone can give me any ideas before I launch this thing into the pool I'd appreciate it.

Specs:
ASUS P4s800D-X mobo
Intel Pentium 4 3.0E Prescott 3.0GHz Socket 478 Processor
330W PSU

 

[riekmaharg2]

1.Your PSU may not be powerfull enough
2.Monitor temps of your computer by downloading Speedfan to see if you system is overheating.
3.Your motherboard maybe faulty

 

[Tedster]

you forgot bios updates, incompatible ram, bad or old drivers.