The EZ Power Supply Tester can not only test power supplies but you can also test other connections such as a floppy drive, hard drive, or other peripherals. To test these, use the appropriate socket on the tester. Make sure the power supply is connected to the tester as well. If the LED lights on the tester are green, then everything's ok.
Above we have an example of results we got from testing a 300 Watt power supply. All LED lights are green so it looks like our power supply is good!
The EZ Power Supply Tester 2 is a handy power supply diagnostics tool, that'll save you from a lot of headaches trouble shooting your computer, and won't cost you an arm and a leg. The tester is available for around 15 dollars US.
Pros:
-Handy
-Easy To Use
-Able to test drives and peripherals also
-Affordable