If you’re like most people, you probably don’t know how to test your computer’s power supply. In this article, we’ll show you how to do it yourself. First, identify the computer’s power supply. This is usually a small black box that sits on the front of the computer. If the box is missing or has been replaced, you’ll need to find an old power supply and replace it with a new one. Next, connect your computer to the power supply. Make sure that all cables are properly connected and that there’s no obstructions in between them. Now turn on your computer and wait for it to start up. If everything seems normal, your computer should be able to find and use the power supply without any problems. If not, check your cables and make sure they’re properly connected before continuing.
You’re concerned your computer troubles stem from a failing (or outright fried) power supply unit. How can you test the unit to be sure that it’s the source of your hardware headaches?
Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.
The Question
SuperUser reader Sam Hoice has some PSU concerns:
How can Sam test things without damaging his current computer or other hardware?
The Answer
SuperUser contributor Grant writes:
Adrien offers a solution for readers who may not be comfortable jamming wires into their power supply unit’s MOBO connector:
USE CAUTION HERE (Though you’d only be shocked with a max of 24 volts)
Plug the power supply into the wall. Find the big 24-ish pin connector that connects to the motherboard. Connect the GREEN wire with the adjacent BLACK wire. The power supply’s fan should start up. If it doesn’t then it’s dead. If the fan starts up, then it could be the motherboard that’s dead. You can use a multimeter to check if there is power output from the power supply.
With a little careful shopping you can even find a highly-rated PSU tester for a measly $6.
Have something to add to the explanation? Sound off in the the comments. Want to read more answers from other tech-savvy Stack Exchange users? Check out the full discussion thread here.
