Is my power supply fried? I hear some short noise from it whenever trying to turn on my PC.

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divis200

Commendable
Jan 15, 2017
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1,510
I tried to add a new cpu to my motherboard (xeon e5472), but after numerous attempts I couldn't get my pc to boot from black screen. Then I tried putting my old cpu back in place. So I connected everything and tried to boot my PC. I was greeted by the same black screen. Fans were spinning and everything was good. I left the room for 2 minutes and when I came back I found my pc not doing anything. I thought that was strange and tried pressing Power button. I heard some very short barely audible hiss. I recreated this thing and I heard that sound coming from Power supply. My fans wouldn't even start spinning. I'm wondering if my Power supply is fried. If it is, does that mean I'm at fault that it fried or was the timing just mere coincidence. I just don't understand how it could've fried as I didn't even touch it.
Edit: When I removed the cpu cooler and unplugged cpu the fans started spinning.
 
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Jake1072

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Nov 25, 2016
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Hello, first you want to make sure everything is plugged into your motherboard. Make sure you have the 16pin main power connected and the auxiliary power (if you have that). I have never experienced a fried psu, buy from what I've heard smoke is a good sign you fried it and make sure the psu fan is running. The sound may be from something in the fan. Double check and see if your psu even supports the cpu upgrade you did as some cpu's will need more power than your older one.
 
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divis200

Commendable
Jan 15, 2017
3
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1,510

The thing is that nothing works until i unplug 4 pin CPU connector. After I unplug it everything starts to look normal, fans start spinning. The psu definitely supports the upgrade. It can handle 400w while the system I have only uses 120w.
 
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gdmaclew

gdmaclew

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May 20, 2008
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Did you turn off or unplug your PC power supply before you did the CPU change?
BTW, a non-spinning PSU fan does not automatically mean a bad PSU. Some of the newer ones do this by design at lower loads.
Listing your PC specs might help as well.


 
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divis200

Commendable
Jan 15, 2017
3
0
1,510

Specs: 4GB DDR2 Ram
AsRock G31M-S R2.0 motherboard
Cpu C2D e6300
Gpu: GT630
2x 512GB hard drives
400w Codegen Power supply
I certainly did unplug pc Power supply before changing the cpu and I doubt my Power supply has any special features.
 
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