On Jun 20, 9:51*am, smlunatick wrote:
You can buy apower supplyquick check tool.

That power supply tester (quick test tool) is almost useless and too
expensive. But few reasons. A defective power supply can still boot
a computer AND will be reported as good by a power supply tester.
Second, a power supply tester does not report on other failed or good
component of a power supply 'system'. Paul has discussed some parts of
that 'system'

Anything a power supply tester might do is performed by the
multimeter. A defective power supply may only be detected when supply
is under full load from a computer. Meter will do that with a
definitive answer. Power supply tester will not.

Paul has recommended jumpering the green wire to black. Another
useful solution is to measure DC voltage of purple and green wires
both before and when power switch is pressed. Everything in a power
supply 'system' is known in less than 30 seconds by those measurements
and without disconnecting things. Even the power switch is tested. No
useful report is provided by that power supply tester. Disconnecting
may create further failures.

Numbers also make possible useful replies from the better informed.
A power supply tester means that additional assistance cannot be
provided. And finally, a meter means learning how that power supply
'system' really works. Quick tester teaches nothing useful.