w_tom

On Aug 14, 10:34 am, K8 notsogrand
<K8notsogr...@discussions.microsoft.com> wrote:
> I'm not trying to be rude or anything.
> But your saying even if the computer is up and working fine. I can still
> have a bad PSU

Yes. For example, a power supply can have failing electrolytic
capacitors. Therefore its ripple voltage is excessive and its voltage
regulation is poor. The computer will work just fine except when load
is maximum AND will fail months later as the electrolytics fail. The
power supply is already defective. Computer still boots OK. Meter
can identify that failure during the max load (multitasking) test -
especially when the failure only creates a rare computer crash.

Another defective power supply works just fine in another computer
but will not work in this one. It may be undersized - but just large
enough to run that other computer. Its signaling voltages may be
defective, just enough to be seen OK by another computer, but not
properly read by this computer's power supply controller.

Two example of how a power supply can work and yet still be
defective. In the second example, one would blame the power supply
controller rather than a defective power supply. Also an example of
why shotgunning can lead to total confusion.