"I have the ability to repair the power supply, with some guidance. It's no different than a power supply in a stereo system, or, realistically, nearly every electronic device that uses a transformer to reduce voltage. I'm not afraid to take it apart and check the components. I'm just looking for smart place to start the diagnosis."
PSU on any PC desktop made can be bench tested.
easy or more complete with tools.
many parts in any PSU have custom contract parts (a secret)
SO ABILITY IS SUPER LIMITED ON PSU. MAKER NOT MODEL TOLD OF PSU./
The Psu has fuse deep inside, some are hidden in the transformer, too. if blow out now the F1 fuse the fuse blows 99%^of the time replaced due to other parts are shorted,most you can not buy
but caps yes and easy.
the fan dead tells you the +12vdc rail is dead (at least)
here is the bench test (forget PC for now)_
jumper test and more.
https://pcdied.com/PSU/power.html#the_jump_start_magic
the PSU needs a good cord AC. not dog chewed.
it needs AC power not dead. at the wall
No funky power strips .
yes monte said check wall power, I use hair dryer,wifes
1500 watts is great test for any wall jack AC 15/20amps /
and first the old silly 115/230 switch not seen today.
this PSU is SMPS unlike cheap home stereo gear.
as seen here great examples
https://pcdied.com/PSU/schematics/html/image_1.html
your day1 new OOBE PSU was 300watt
hp #
5188-0129
here it is day1 new, shown at hp partsurfer.com
avoid electric shocks seen here.
https://pcdied.com/PSU/schematics/images/bridge-hv-ouch.jpg
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