New custom build made loud POP noise.

theproadam

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Apr 3, 2014
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After finally assembling everything, and some troubleshooting to boot, my new pc made a loud sudden "pop" noise and shutoff. Everything was new except two old HDD from my old computers.

Now I'm too scared to try and turn the PC back on.
I was just in the BIOS trying to figure out how to boot a old HDD.

Parts List:
CPU: Intel - Core i3-8100 3.6GHz Quad-Core Processor
Motherboard: Gigabyte - B360M DS3H Micro ATX LGA1151 Motherboard
Memory: Kingston - HyperX Fury Black 4GB (1 x 4GB) DDR4-2133 Memory
Case: Deepcool - TESSERACT BF ATX Mid Tower Case
Power Supply: Corsair - CXM 650W 80+ Bronze Certified Semi-Modular ATX Power
https://ca.pcpartpicker.com/list/6VdNq4

Is it possible that the PSU blew? CXM 650W here.
UPDATE: upon further inspection the motherboard looks OK.
 

AniChatt

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It seems the PSU is blown becs except the PSU other components are not supposed to create that noise if burnt. Before trying to turn it on, check if you have swapped the PCIe power in CPU power (EPS) socket or the opposite. Just in case a basic check. Then remove all cables one by one and inspect if there are any bent pin in all power cable. Unlikely though becs these new PSUs has a circuit protection feature which turns the system off if you have done something bad.
Then remove the psu and jump start it with paperclip method. If it works then you have to test the system again.
 

theproadam

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Apr 3, 2014
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Is it possible that one of the cables go shorted on the case itself? The PSU is a semi-modular one, and the 24pin and the cpu ones were the only necessary ones, so they had to be connected to the correct ports.
 

AniChatt

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It might be a faulty PSU so check it first if it is working properly or not. I have just asked to check PCIe power vs EPS power connector in the mobo since these two looks identical and its a common mistake. If you are sure no problem then.
 

theproadam

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Apr 3, 2014
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OK, I had to go to school so I coudn't have tested any longer. So the next day I tried the paper clip thing, and disconnected everything but the deep cool fan. Swithching the PSU on, the fan started up normally.

UPDATE: I've turned on the PC again. Everything seems to be working fine.
It it possible that a capacitor was blown?

UPDATE 2: Everything looks and smells OK. I got windows running, and going to leave it for some time.
 
use 3 party programes like hardware info to check power supply output and use the mb health screen to check the voltage output of the power supply. if it was not a power supply failure did you drop and lose any screws?? a drop screw will cause a dead short.
 

theproadam

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Apr 3, 2014
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OK, I checked the the voltages on the mobo health screen. Images: https://imgur.com/a/p5lxPa4

I don't believe I dropped or lost any screws, and shaking the pc, made no screw rattle noise.

The Pop happened after the third reboot, I was just in the BIOS, however I couldn't see any flash. Opening the case 10 minutes later, I couldn't smell anything abnormal.

Although I noted that these wires weren't the best so I simply covered them with electrical tape.

EDIT: One thing to note, I had connected the case fan to the mobo and the PSU.
 

AniChatt

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1. Which cables? Why electrical tape?
2. How it is possible to connect a fan from mobo as well as PSU? Recommendation: connect fans on mobo only. If you have extra fans then you can get a slitter cable up to fan size of 140mm. Max two fans on a single header not more than that.

 
It was the fan. Don't give power from both PSU and mobo, that's too much power. Only one or the other.

*Some fans have a 4-pin molex and a 3 or 4-pin fan header so you can choose which to use; don't use both.

You might want to replace that fan because the wiring could be burnt.
 

theproadam

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The Fan connector had a 4 pin psu connector and a 3 pin coming out of it. I had thought that the mobo could control the speed and the psu would power it but thats not what was happening. Either way, I switch to the motherboard, and the fan looks perfectly fine.

However I noticed that whenever I unplugged the computer or switched the PSU off via the back, when trying to power on the pc, it would beep 5 times and just run without any output. Apparently this is bad CPU, however if I turn off and back on multiple times(1 or 2), the PC will eventually start. In windows everything works OK.

Personally I think there is a capacitor that provides instant power to the CPU when the PSU is unplugged and plugged back in, and that capacitor had blown. (I may be wrong)
 

theproadam

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Yes I have tried without the fan and the issue still occurs.
I had also tried leaving the CPU power cable disconnected but the PC wouldn't beep at all.

I had also noticed that the BIOS would get reset.
 

AniChatt

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Connect fan only on mobo if you can not both. The beep pastern is telling you something. Open the mobo manual and read what is the meaning of 5 beeps. It is failing to initialize something. In that case say during boot 5 successive beeps (be careful it means when you turn on the pc it beeps 5 times successively not in between power of then on, it should be continuous) means say for e.g. failed XPM profile then your psu is ok you have to check the xpm you have selected like that. First check it with your mobo manual then update.
 

theproadam

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The 5 beep CPU error has gone away. The PC has been working fine for about 3.5 weeks, and upon inspection I cannot find any blown looking capacitor.
I had ran hot CPU tester, and it didn't crash, and other Intel utilities that all passed.
Everything looks and works fine, the only issue remains that there are 5 unrecognized drivers however I do not think that this has anything to do with the previous problem.

I'm planning on buying another 4gb stick of ram, and a GTX 1050/1050ti/1060 3gb, which would really suck if the PSU is really faulty.