How to Test a Computer Power Switch
The power switch on the vast majority of computer cases, cheap or expensive, is simply a plastic mechanical momentary switch. The cost of the case generally has no bearing on the quality of the switch used. Being made mostly of plastic, these switches can and do break and stop working. Unfortunately, unless they break spectacularly, they generally still hold together, and will still make the clicking noise you are used to hearing every time you turn your PC on. So testing the switch, while a bit of a pain, is necessary. Luckily, it's also a cheaper alternative than other things that could be wrong when your PC will not turn on.
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Things You'll Need
- Basic multimeter with continuity test capability
- alligator clip lead for the multimeter
- Phillips head screwdriver
Instructions
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Locating, Removing, and Testing
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1
Remove both side panels from the case.
Observe how the faceplate of the case is attached. Some cases use small Phillips screws, others use plastic tabs.
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2
Disconnect all of the wiring coming from the case face connecting to the motherboard. Note where each connector goes, and which way it faces.
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3
Remove the faceplate from the case, moving the wiring along with it.
Locate the power switch. Chances are it is secured to the back of the faceplate with a dab of hot glue. You should be able to simply pick the glue away and remove the switch from the faceplate.
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4
Set your multimeter to continuity testing.
Attach the alligator clip lead to one of the switch leads.
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5
Hold the other lead to the remaining lead on the power switch, then press the switch down. If the switch is still functional, the multimeter will sound a tone to let you know there is continuity. If there is no tone, then you know the switch needs replacing.
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Tips & Warnings
Always be cautious when working with electricity. Follow the manufacturer's specific instructions when opening your computer and using your multimeter. Using a multimeter incorrectly can cause damage to the computer, or to yourself.
