Lack Of power could do weird things, like casue a shutdown.
It seems you have tried many different option to get this working. Maybe you should consider bringing the Motherboard and processor back for an xchange, unlikly, but the board, or the processor, or the mem could be bad.
With all thse posts it shows you how many things could cause this type of issue.
Poor power supply (not enough)
too much heat
bad processor seating
Bad Hard drive
Bios needing upgrading
XP doesnt normally do the BSOD unless there is a big issue involved.
Here is anothe link i just found.
which lead me back to microsoft and to here:
which lead me to review all of these posts and i noticed no one except killians45 mentioned checking for a Master Boot Record virus.
This article describes how to troubleshoot these error messages.
This issue can occur if a requested page of kernel data could not be read from the paging file into memory, or the master boot record is infected with a virus. .........
Read that article it is specifically for XP and that error.