Re: Odd PSU problem

philo wrote:
> Had a power supply die, so I replaced it with a used one I had that I 
> had marked "good."
> 
> It booted to the bios and I just set if for default but it never loaded 
> the OS. It just returned to the bios.
> 
> HD was detected and set for first boot option.
> 
> Though I was sure I had a legacy Win10 install, I did try UEFI but still 
> could not get past bios.
> 
> 
> Finally a cracked open a new in the box PSU and all worked fine. I 
> assume there was some low voltage.
> 
> 
> Both sup[plies went to a metal scavenger

You could have tried a memtest floppy.

One of the slightly older single threaded versions.

Then get out your multimeter and checked supply voltages.

I suppose Power_Good was signaling a problem.

I'd probably have the hard drive disconnected while
working on it at this point. To reduce the chances of
damaging it. Disconnect power and data.

Or, you could put a dummy load on the PSU to test it out.
I have a dummy load, but it is "lite" and hardly a test.
It's enough though, to tip over my "weak" PSU, which is
the original Heroichi (HEC) bought for my first PC. It
hasn't blown up, but that supply can only run one 12V
fan before that's too much for it. Not enough power
to run a CPU. That supply is from well before the badcap
era. Haven't thrown it into the chipper yet.

I like about 100W for a dummy load. As higher loads cost
money :-) And my electronics store is gone, so easy access
to their power resistors is now gone too.

    Paul