Bad PSU? Or bad mobo?

Cavalierhero

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Apr 2, 2014
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4,510
i5 2500k stock speed
GIGABYTE GA-P67A-UD3-B3
8 GB RAM Crucial Ballistix 1600Mhz
1TB Samsung SATA HDD
nVidia 560ti MSI TwinFrozr
Corsair 550vx PSU (quite old probably 4-5 years)

PC has been working perfectly fine until today.

I woke up this morning and decided to clean my PC as I always do with a can of air to dust it, made sure none of the liquid came out, I don't tilt the can. I also used a brush to brush fans clean and other components. Then when I hooked it up again the PC would not respond to the power button, I unplugged it and made sure everything was as it should be connection wise and tried again, still nothing.

After pressing the button a few more times it turned on but the PC didn't post, no beeps, everything else had power but the HDD activity light stays off too, I hear them spin up though. The light on the MOBO (phase LED #1) comes on, but doesn't budge from there. When I press the power button when it's on it turns off and doesn't come on again unless I press the power button many times.

I also noticed the PSU makes a buzzing noise while its plugged in, on or off. No burning smell.

I'm about to go get a PSU to see if a new one will fix it, but would you guys have any ideas on what it is? Do you think in the process of cleaning something might have happened?
 

Cavalierhero

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Apr 2, 2014
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4,510


'
Thing is I didn't dismantle anything other than taking out a couple fans to clean the blades, their connectors didn't come loose or anything. I double checked the 8 pin and 24 pin MOBO connectors and they're in fine, I tried to turn on the PC without the RAM but it just doesn't respond to the power button unless I try many times, even so like I said it just sits there, no POST or beeps.

I'll try to do that though.
 

Cavalierhero

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Apr 2, 2014
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4,510
I just got a new Coolmax 700w 12v single rail at 52amps and tried it out, still doesnt turn on until I press power button multiple times and when it does the PC doesnt POST
 

Cavalierhero

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Apr 2, 2014
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Yeah I'm returning it, I just wanted to see if it was the PSU. A man at the PC parts store hooked up my Corsair to a tester and it was reading 4volts where it should be at 5volts and it also didn't respond immediately when he flipped the switch.
 


If you have a mobo speaker and no beeps likely bad board if it gets that far in the boot cycle!
 

Cavalierhero

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Apr 2, 2014
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Yeah figures, it turns on, HDDs spin up, Phase 1 LED on MOBO lights up, and nothing. It has speaker because I've heard it beep.
Well it might be that both PSU and MOBO are bad I guess. I'm gonna have to hit up Newegg and look for Sandybridge mobos they might have left over.
 

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