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Newly build computer only turns on for a second...

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#1 bladetucker


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Posted 23 March 2013 - 09:38 PM

Hello, read the sticky about troubleshooting when PC doesn't turn on, but thought I'd start a thread just to make sure I didn't miss anything.


Hooked up my new SeaSonic M12II 620 Bronze 620W to my ASUS P8Z77-V LK LGA 1155 Intel Z77  with Intel Core i7-3770K Ivy Bridge 3.5GHz and stock fan. 


Motherboard spins the CPU fan and Case fan for about 2 seconds then stops.  Disconnected everything but the fans from the mobo and that's all I get, 2 second of power.  Switched out the PSU for one I know works and still no progress.  Guess the motherboard is DOA, eh? 


ASUS customer service is down for the evening, so just thought I'd talk to some experts here. 

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#2 dpunisher


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Posted 25 March 2013 - 08:33 AM

Any diagnostic LEDs lighting up on the board?  Tried swapping out memory, is it in the correct slots?  Have you reset CMOS?


Well, try old reliable.........


Board out of case, on a non conductive surface.  CPU installed with cooler,1 stick memory in whatever slot your owners manual says to use with one stick of memory, and a monitor hooked up to the video output on the board.  Hook up PSU to 24 pin connector, and the 8 pin by CPU socket.  Short the "on/off" terminals together on the mobo and see what happens.  No work?  Pull the CPU and ck socket for bent pins/contacts, look close.

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#3 rotor123


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Posted 25 March 2013 - 10:59 AM

One other thing to check. Make sure the Heatsink is in full contact with the CPU and has the right amount of heatsink compound.

I have seen your symptom due to the heatsink not being installed properly. The Computer will shut down to protect the CPU if it gets too hot. it only takes a second or two with modern processors.

To Much or too little heatsink compound can also cause heat issues.


Good Luck


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