I want to test a pwr supply that I pulled out of a computer... is this possible

I have read that I can test it when it is hooked up in the case yet but its hard to get a good reading so I disconnected it and would like to test the voltage. if I put one probe in one or more of the sockets would I be able to get a accurate reading or does the pwr supply need to be connected to the motherboard yet.
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You just need to short the two pins for the power switch to turn on the power supply, then you can measure the voltage from the various pins. Although be careful not to short any wires you shouldn't.

Alternatively, you can buy power supply testers that you can plug it into which will do the testing for you without the need for a PC.

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dbruntonQuid, Me Anxius Sum?  Illegitimi non carborundum.Commented:
You can measure the voltages that way with no problems.

But read this http://www.hardwaresecrets.com/article/Why-99-Percent-of-Power-Supply-Reviews-Are-Wrong/410/1 especially Page 2.
That's a really good article, good find.

I'm not sure what you are trying to achieve whether it be a quality test of the PSU or just finding if it still works, if it's the later a simple PSU tester or reading the voltages will suffice.
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Keep in mind that the power supply may not work if you don't have an adequate load applied to it.  If you just power it up with nothing attached, it may shut itself off.
the only real valid test is booting a pc with that motherboard, all other tests are fine, but not conclusive imo
how to power it up : http://www.gideontech.com/content/articles/196/1
here a nice article on it :  http://www.techrepublic.com/article/power-supply-troubleshooting-with-a-multimeter/1056686

a flowchart on how to diagnose it :  http://www.fonerbooks.com/power.htm
jploesslAuthor Commented:
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