Unexpected power off..and on

If you use the button to turn on the computer it works, some time. But, when it does not, you just bump the button or side of the case and it start like the old happy days jute box. How can you test the switch to see if it is a fault? I have checked all the connections on the board and everything appears to be fine. Please, I could use some help.
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More about unexpected power
  1. Check the wire connections at both ends of the switch cables.

    Check the wire itself for potential kinks or breaks.

    Replace the switch
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Homebuilt Computer Power Systems