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Ralph Mowery

In article ,
says...
a multimteter will tell you what's coming out of the psu.

It's hard to get a connection to the interface between the PS
and the computer when it's plugged in.
Measuring the PS unloaded can tell you if it's dead, but not
much else.
junk snipped

It's the first thing I'd do. What's the first thing you'd do?

Probably the first thing I would do also.

With some of the multimeters less than $ 10 everyhone should have one
and have a basic idea of how to do simple measurments.

While it would not tell if the power supply is working, it will tell if
it is totally dead or maybe if the voltage is way too high or low.

An ohm check across the primary of the supply could tell if it was bad,
but with the moden supplies it may not.

Some of the switching supplies may not show a voltage if not under load,
but still that is where I would start.