z420 Workstation shut down after emitting a burning smell. No visable evidence of fried components.
Now it Blinks/beeps 4 times between pauses when I try to power up.
I unplugged everything from the motherboard and I still get the same blink/beep code.
I figure it has to be the PSU, the Processor, or the Main board.
I don't have time or $$ to replace all three.
How can I find out which is bad.