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Computer only boots if power switch cable is removed

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#1 Raspite


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Posted 18 August 2016 - 06:20 PM

So we started with a HP Pavilion p7-1020, which we added a GV-N960IXOC-2GD to.


Now we're trying to update the CPU, which has required us to get a new motherboard as well, because the old CPU socket was AM3, and the CPU is AM3+ (The CPU is AMD FX 8350). The motherboard is M5A78L-M/USB3.


Originally, when turned on, the fans would run for a bit, then turn off. We never got to the BIOS.


We found out that if we flip the case switch on, then touch the power switch cable to the pin it's meant to go in, then remove it, the computer boots correctly, gets to the BIOS, and stays on.


If we plug in the power switch cable while it's on, it turns off.


We also found that if we turn it on normally (with the power switch cable staying in) without the CPU plugged into the motherboard, the fans turn on and stay on, but we don't get to the BIOS. Any suggestions?

Edited by Raspite, 18 August 2016 - 07:44 PM.
Moved from System Building to Internal Hardware - Hamluis.

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#2 rqt


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Posted 19 August 2016 - 03:49 AM

Front panel power switches these days are a momentary contact switches that only connect (to either turn the machine on OR off) while the button is pressed.


The behaviour you describe is probably that of a switch/cable assembly that has a permanent connection. Test again missing out the "flip the case switch on" (as this is a nonsense statement given the momentary action of the switch) to double check - in which case you have managed to damage the power switch or its wiring - you have probably simply shorted the 2 wires together at some point.


You can easily test the operation of the switch/cable assembly (when disconnected from the motherboard) using a multi-meter or a test light.

Edited by rqt, 19 August 2016 - 03:54 AM.

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