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Have no idea, is this a PSU problem or... any help appreciated ! :)


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#1 Kasumione

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Posted 31 March 2015 - 05:58 PM

Hi there! 

Thanks in advance for any help you can give to me..

My home built pc has been working perfectly for the past 2 years. Today the pc made a windows registry update and shortly after (say 5-10 mins) the pc closed down and would fire up for a split second only - afterwards.

I removed the PSU and used a paper clip to test the PSU and the fan started up, i connected the PSU to my hard drive, disc drive and they both started up without shutting down. When I connected it to my motherboard the lights of the board light up, but when I powericon1.png on the motherboard it starts for a split second, shuts down and then will not power on at all afterwards unless I leave it for a 30 seconds in which it repeats the same process. 

Could this be a bad power supply unit although it did seem to work well when powering disc and hard driveicon1.pngindependently. Motherboard has not been moved or bashed around, was brought brand new, Asus deluxe z77.

Also to mention that the heat sink fan spins and cuts out with the rest of the equipment on powering up. There is very little dust in the heat sink fan..

I have also removed the ram and tried to boot the mother board and cpu independently with the same result..

Confused, would be a shame if motherboardicon1.png was faulty as it was new, undamaged and could not see why there would be a problem from nothing happening to it.

PSU is a corsair CX 430 
i7 3770k processor 
16gb corsair vengeance ram
Velociraptor harddrive
Samsung disc drive 

Thank you as any help and advice is appreciated !



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#2 mjd420nova

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Posted 31 March 2015 - 06:28 PM

Yes. this does sound like the PS gas failed.  12 volts is used to run the fans and the drive motors but 5 volts is needed for the logic circuits, that's what's missing.  The appempts to start but fail are due to the PS voltages not being what they should and it shuts itself down.  the circuits will hold a little voltage after shut down, thus the need for 30 seconds for the voltages to bleed off and reset the protection circuit.



#3 Kasumione

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Posted 31 March 2015 - 06:36 PM

Thank you for confirming this to me mjd420nova! :)

 




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