They Do Make Power Supply Testers.
Allows quick and easy testing with built-in 25W 5.4 ohm load to generate steady outputs.
Allows quick and easy testing
Built-in 25W 5.4 ohm load to generate steady outputs
POWER_OK green LED indicates power supply is working
+5V, +3.3V & 12V leads for volt metering to check output voltages
To test the power supply:
Unplug any devices that are connected to the power supply
Unplug the 20-pin ATX connector from the motherboard
Plug the tester into the power supply's 20-pin ATX connector
If the POWER_OK LED lights up, the power supply is working.
Improvise - Adapt - Overcome
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Very handy piece of equipment.
I got mine from newegg.