Computer will not turn on

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Brandon8483

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The light on the front and lights inside are on, but when I press the power button nothing happens. No fans are on or anything. I hear like a small clicking sound other than hitting the power button but that is it. But that only happens the first time I try. I have let it sit unplugged for well over an hour and plugged it back in with same outcome. I believe it’s the PSU but looking for verification.
 

Brandon8483

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Correction. Only one light on the motherboard turns on. A red one in the bottom right of it as well as the red light on the front next to the power button. Literally that is it.
 

lochlomonder

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It's possible the motherboard is damaged; however, that's not a 100% certainty. Check the connections to/from the motherboard and ensure they're all connected properly. Make sure the power is disconnected from the PC and then hold in the power button for 1 minute to ensure the capacitors have discharged. Remove all cards, e.g. video card, and remove the RAM DIMMs. Once you've done that, plug back in the power and then try turning on the PC. Are there any beeps at all? If it's silent and you're still seeing that red light on the motherboard, I'm guessing it's damaged.
 

crjdriver

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I believe it’s the PSU but looking for verification
The best way to test a pw supply, is to swap in a known good unit. Note you do not have to fully install the test unit; simply connect atx, aux, and video pw [if used] Hit the ON button and see if the system will POST. If it does, shutdown and fully install the test pw supply OR install a new one. If the motherboard will not POST in the above config, then you will need to swap parts with known good units until you find the failed part.

There are pw supply testers however [IMO] they are next to useless.
 

Brandon8483

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When I hit the power button I hear a click in the power supply, it just won’t power up. Wouldn’t that suggest that the motherboard isn’t bad since the power supply is registering that the power button is being pushed?
 

managed

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If you don't have a test power supply the red light on the motherboard should tell us something, what motherboard is it ?

Also if the red light on the case is for the hard drive activity try disconnecting the hard drive power cable then see if the PC powers up.
 

Brandon8483

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I’m not sure what motherboard it is. But here is a picture of it. And no I do not have a test pw supply.
 

lochlomonder

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The CPU heatsink looks clogged with a thick layer of dust, as does the exhaust fan. It's possible it overheated, but I cannot say for sure. As others have suggested, see if you can test the power supply unit in another PC to ensure that still works, and then we can try troubleshooting other components.
 

managed

Allan
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On the photo I can make out A785GM-M I think, can you confirm that and see if there are any more characters ?

I would consider cleaning the Cpu fan & heatsink, it does look very clogged up. If the fan can't spin that could be stopping the PC from powering up.
 
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