Computer Turns On For A Split-Second and Then Turns Off

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blockhead12

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Mar 26, 2014
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I built my computer a few months ago and I had everything working up until now. I bought a new CPU fan a couple days ago and just now had the time to install it. I unplugged all of the cables to my motherboard because I thought I was going to have to take it out in order to install the fan, but I then realized my case had an opening to the back of the CPU so I didn't need to. I then put in the fan being careful not to touch the CPU or motherboard. I then plugged everything back in and turned on my computer but it only turned on for a second and then right back off. I checked every fan and they all turned on and so did the LED's on my motherboard. I'm not sure what could have happened from me putting the fan in but if anyone know's what might be the problem please let me know.

Specs:
Motherboard - Asus P8Z77-V LK
Graphics Card - GeForce GTX 760 4GB
CPU - Intel i5 3570K LGA 1155
PSU - Corsair CX500
 
Solution
thatmoney
Did your computer start up when put back on the old fan? We can only really narrow down the problem is that if you can test the fan in a diffrent computer and if that computer starts up then we could look into other issues that might be causing it.
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JimF_35

JimF_35

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Dec 27, 2010
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"but I then realized my case had an opening to the back of the CPU so I didn't need to"

So you probably got a back plate. Did you put it on backwards where the metal is touching the motherboard? Send us a picture?

Thanks
 
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thatmoney

thatmoney

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Dec 26, 2013
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I going to geuss at this, but it might be the fan you bought. Im geussing your new fan is damaged and the fan is not spinning at high enough speeds and when your computer boots up it detects the fan not running at the right speeds and shuts down. Do you have any other computers that you might be able to test out your new fan in?

Note: I did the math on your hardware and there you dont not have to worry about not having enough watts for your power supply.

Asus P8Z77-V LK- 47w idle
GTX 760 104w idle
ntel i5 3570K LGA 1155 77w

Total wattage usage: 228w/out of 500w. Please note I used the ide power usage not while its under full load.
 
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blockhead12

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Mar 26, 2014
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Unfortunately not but I think I'll try to put the original fan back in to check.
 
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blockhead12

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Mar 26, 2014
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I just checked all the wires and it still turns off after a split second. Any other suggestions?
 
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thatmoney

thatmoney

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Dec 26, 2013
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Did your computer start up when put back on the old fan? We can only really narrow down the problem is that if you can test the fan in a diffrent computer and if that computer starts up then we could look into other issues that might be causing it.
 
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Solution
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blockhead12

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Mar 26, 2014
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I just tried using the stock fan and I was still having the same problem.
 
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blockhead12

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Mar 26, 2014
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Never mind I just got it to work with the stock fan. I also want to thank everyone here who helped me. I might post again on here if I'm having trouble again with the other fan. Thanks guys!
 
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