Originally Posted by rhikdavis
Nah, this was bought in Russia about ten years ago.
Check the dipstick first, it's probably low on Vodka.
You can test it, if it's built to ATX specs. Look in the big 20 wire bundle where it connects to the motherboard. Is there a single green wire, and a single gray wire along with all the black, red, and yellow wires?
If so take a small piece of jumper wire, like #24 telephone wire or a single strand from a larger wire (it's only 3.3V it's not going to shock you), and stick one end into the back of the motherboard connector so it contacts the pin base for the green wire. Touch the other end of the jumper wire to a black wire, either in the motherboard connector or a 4 pin power connector. If the power supply starts up it's probably good and there is a problem somewhere else, if it doesn't it's bad.
With the green wire grounded and the supply running use a voltmeter to check the output. You should have 12V from any yellow wire to black (ground), and 5V from any red wire to black. If either of those voltages are off then the supply is bad.
If it starts up while the green wire is grounded, but then shuts down before you can check voltage you probably have a short in the motherboard, video card, harddrive, etc. and the power supply is shutting back down due to it's overcurrent protection.