My PC died, but I don't know which part

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Sensei Nacho

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Aug 30, 2013
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I was playing Guild Wars 2 and my computer was making horrible fan noises (extremely loud whirring) that seemed to be coming from the PSU and GPU area, but I am not sure. I went to the back of the computer and switched the voltage on the PSU. I didn't know what the numbers were, but I changed it. It did nothing for a couple seconds then my computer stopped. It will not start any longer, but the motherboard has power (lights are on). Does anyone know what could be wrong?
 
Solution
M
Hi

If your mains voltage is 230V and you set switch to 115V then powered on you would either blow up your PSU or if very lucky a internal fuse would blow.

I have seen this occur and after replacing fuse PSU started working again

BUT safety warning you should not work on inside of PSU for several days after disconnecting from mains.
High voltage will be stored on capacitors

PSU is obviously not completely dead if leds on motherboard are on

What is the mains voltage in your country ?
Europe is 220/230/240V (mainland Europe is 220V - UK is 240V but both state 230V)
USA is 115V
voltage switch on PSU must match the voltage of local mains
[most modern PSU are auto-swiitching and will work with 100V to 250V]

If that does not fix...
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Sensei Nacho

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Aug 30, 2013
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nope, it just stopped working. Could I have shorted my CPU? I don't know how to troubleshoot this stuff, just build it!
 
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Rick Kraster

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Jul 18, 2014
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i had this problem once with a build it was very frustrating i would suggest get all the cables out of the back of the pc and leave it for about 5-6hours more time is always better than try to turn it on again if it turns on there is something wrong with your psu

you can also try to get all your ram out of your pc and get 1 ram unit and try it with all slots 1 for 1

if you build it yourself you might also want to check if you did not bend any pins on your motherboard when installing your cpu
 
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Sensei Nacho

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Aug 30, 2013
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I guess I'll wait. I have had it for over a year, so I don't think it is bent pins.
 
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mbarnes86

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Sep 16, 2010
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Hi

If your mains voltage is 230V and you set switch to 115V then powered on you would either blow up your PSU or if very lucky a internal fuse would blow.

I have seen this occur and after replacing fuse PSU started working again

BUT safety warning you should not work on inside of PSU for several days after disconnecting from mains.
High voltage will be stored on capacitors

PSU is obviously not completely dead if leds on motherboard are on

What is the mains voltage in your country ?
Europe is 220/230/240V (mainland Europe is 220V - UK is 240V but both state 230V)
USA is 115V
voltage switch on PSU must match the voltage of local mains
[most modern PSU are auto-swiitching and will work with 100V to 250V]

If that does not fix problem you need to find some one with a spare known working PSU of correct power rating and see if this will start up your PC. If not you may have fried your motherboard

regards
Mike Barnes
 
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Solution
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Sensei Nacho

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Aug 30, 2013
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10,530


Thanks for the informative reply. I live in the U.S. and I flipped the switch while it was on. I know it was stupid but I was just trying to get the noise to stop.
 
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Sensei Nacho

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Aug 30, 2013
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I just plugged everything back in and it works! I didn't know the whole volts thing so thanks for that information. I will never be that stupid ever again!
 
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