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New PC build will not do first time power-up


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#1 MSaintJohn

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Posted 31 May 2015 - 10:08 PM

Hello all, just built a new PC with some parts new, some from my old rig.

 

After everything was put together and I tried to turn it on for the first time, nothing happened. No lights, no fans, just an audible click from the power supply. When the power button was pressed a second time, it had no click. 

 

I have tried dis-assembly/reassembly, but don't really know where to go from here. Any help you can give is really appreciated!

 

System Specs

New Parts

CPU - Intel I7-4790K

MOBO - ASUS Z97 GRYPHON

RAM - HyperX FURY (2 x 8GB)

SSD - Samsung 840 EVO 500GB

Case - BitFenix "BFC-PHM-300-KKXKK-NV"

Old Parts

GPU - EVGA GTX 670 FTW

PSU - Corsair AX750



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#2 TsVk!

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Posted 01 June 2015 - 01:49 AM

If you have a multimeter I suggest you test the power supply. (I would test that first)

 

Here's a pic so you know what the voltages are.

 

atx-connector-20-24pin.jpeg


Edited by TsVk!, 01 June 2015 - 01:49 AM.


#3 jonuk76

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Posted 01 June 2015 - 12:25 PM

Even if there is a major problem, like CPU or memory not recognised, it should still power up and spin case fans etc, assuming power switch fitted to the right pins on the board.  The fact it's not is odd.  If the power supply is not even turning on I would suggest testing it by attempting to power it on manually.  You do this by shorting the PS_ON pin (often a green wire) to one of the ground pins (COM in diagram above) (usually black).

 

It sounds scary but if you are careful, it's safe and straightforward.

 

This shows the process.

 


7sbvuf-6.png


#4 TsVk!

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Posted 01 June 2015 - 03:49 PM

Of course... silly me. :crazy:

 

Wasn't thinking clearly about that one.



#5 MSaintJohn

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Posted 02 June 2015 - 06:16 PM

Followed the instruction from the video and the power supply and it definitely is not working. The fan just twitches and it makes a click like it wants to start, but doesn't go past that.

 

Is there anything I could be doing wrong or should I start shopping for a new psu?



#6 jonuk76

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Posted 03 June 2015 - 06:35 AM

On the basis of that information, it does sound likely the PSU is at fault.  The Corsair AX series is generally considered very good, and Corsair are quite helpful.  Is this a new part or one of the old ones you are re-using? EDIT I see it's an old part.  It's worth checking whether its covered under a warranty in any case.


Edited by jonuk76, 03 June 2015 - 07:17 AM.

7sbvuf-6.png


#7 MSaintJohn

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Posted 07 June 2015 - 11:19 PM

Found a replacement power supply and installed it. Everything has been working perfect since. Still trying to work on the warranty for the old PSU, but everything else is good to go.

 

Thanks for all your help, I really appreciate it!






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