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Spontatneously shutting down

By hartwith ·
When power button is pressed, the pc starts up and will run for a moment or two-sometimes right through to windows but mostly only for a couple of seconds or so-when it shuts down it will start up again without intervention and may just stop and start continuously. I changed the psu with all drives disconnected. Same problem. I changed the motherboard and system ram and cpu and fan. Same problem. However I then discovered that if I start up the power by momentarily shorting out the two pins which the case power button lead is normally connected to everything works ok. There does not seem to be a short or identifiable fault with the pair of wires which connect the case start button to the m/board. I am completely stumped with this one! The logical answer seems to be the system case somewhere but I cannot see why.
Any ideas?

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Spontatneously shutting down

by comtech1 In reply to Spontatneously shutting d ...

I have recieved many cases like that and also the power button will wear out on the case kid your self NOT. The parts inside just are not made for a lot of wear and tear anymore. I am sure if you change it out it will fix your problem!
Good Luck!

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Spontatneously shutting down

by hartwith In reply to Spontatneously shutting d ...

I changed the case! Problem solved

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Spontatneously shutting down

by hinrgman In reply to Spontatneously shutting d ...

you need to replace the start button and wiring at the very least, if you can find a replacement.
The other option is to replace the whole box which will have a new button and wiring to the MB

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Spontatneously shutting down

by hartwith In reply to Spontatneously shutting d ...

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Spontatneously shutting down

by RCOM In reply to Spontatneously shutting d ...

It's just a faulty power button. Sometimes the plastic cracks or breaks which doesn't allow the button to fully depress. So it stays connected. You can replace the button pretty easy. Or connect the main pins to the reset button.

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Spontatneously shutting down

by hartwith In reply to Spontatneously shutting d ...

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Spontatneously shutting down

by hartwith In reply to Spontatneously shutting d ...

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