Random Reboot is now a Memory Dump

Me again. Soon as I closed out the question about the Dell Win2K PC randomly rebooting, I got Blue Screened with “Beginning Dump of Physical memory” and PC hung there until cold booted. Another line said DriverIRQL_NOT_LESS_OR_EQUAL_TO_0. I guess the problem has progressed to the next stage of failure. Power supply? Overheating? I’m beginning to believe it’s a software issue now. ARG!!