A diag utility that runs from CD or USB would be my preference.
I'm having some trouble with a desktop PC that I support, and I haven't been able to figure out what is going on with it. I used Memtest86 to rule out the RAM, but I'm wondering if the motherboard or CPU is the issue. In the BIOS, I'm told that the vcore voltage is not right… I replaced the power supply, but that did not help. The computer will randomly freeze up.