A couple desktop PC's.
One had the power supply fan die which caused the power supply to fry.
Tried to replace it with a known good one, PC still won't run.
The power supply may have taken the motherboard out as it went out to pastures.
I have no compatible MBO to swap over, this PC may go down the road for parts.
Second desktop PC came to me with erratic Windows Bluescreens.
It is the first time I have it to look over, found several issues.
The motherboard requires a 24 pin power supply, a 20 pin is utilized - the MBO may not be getting all the electricity it needs.
The hard drive has bad sectors, it is a Seagate. I own 5 Seagate HDDs, 3 have bad sectors and cause system hangs, 1 will not register to the MBO at all - it is safe to say that this drive is toast (or at least can no longer be used as a system disk).
CPU was overheating, fan was running at 100% all the time. Some dry grey goo was utilized between the CPU and the heatsink, I replaced it with Silver grease thermal paste. I bet the CPU feels better now, it's an AMD.
This PC is functional as of today evening.
Messing with these PCs reminded me why I stopped doing crap jobs like these, they are a huge waste of time.