I have a client's computer that blue screen's and then reboots itself. Scanned for malware and removed tracking cookies only. Started rebooting with greater frequency. Tried to startup in Safe Mode, and it blue screen's and reboots before it finishes starting up Safe Mode. Tried to load a UBCD. It blue screened (IRQL_NOT_LESS_OR_EQUAL error) when loading SuperAntiSpyware. Swapped out the RAM with another identical computer, then tried to boot to the UBCD. Blue screened again with a "PAGE_FAULT_IN_NONPAGED_AREA" error. I took out the swapped out RAM, and re-installed only one of the original DIMMS.
I am suspicious of hardware, but there's only so much I can swap out on this HP Compaq dc5000 SFF. RAM and the processor appear to be the only swappable parts, other than fans, etc. The NIC is hardwired. No other add-ons in any slots.
Before I replace the computer, any suggestions for troubleshooting?