0 Votes
There is typically a CMOS-reset jumper to clear the BIOS, clear it.
If the motherboard does not do POST, or at least beep like crazy with just the processor, then it's either the MOBO or the processor. My experience has been that motherboards fail more often than processors. Look for swelled or popped-open capacitors on the motherboard.
Dell Optplex 170L failing to power on