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Custom desktop PC starts for 3 seconds then turns off


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#1 iceking77

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Posted 29 May 2016 - 11:00 AM

My custom built desktop PC out of no where has stopped turning on. When I press the power button it starts and the leds turn on for about a couple seconds then it just turns off and tries again a few seconds later. All the fans seem to be working so doesn't seem like a component is obviously dead, at least to me. I also have checked cables and it seems like everything is connected. As well I re installed all my ram and nothing changed

I noticed the CPU fan wasn't turning on immediately, so I tried unplugging it and re plugging it back in then the fan turned on and my desktop actually started and didn't shut down, but this time my monitors would not recognize the graphics card.

I then turned it off and tried to reinstall the graphics card but after doing this now the desktop has gone back to just shutting down immediately after being turned on.

Not sure if this means I have a CPU issue, maybe it's connected to the fan not turning on? 

Thanks!

 

Specs:

Intel i7-2600 CPU

16gb G.SKILL Ripjaws X DDR3 RAM

AMD Radeon HD 7800 Series

 



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#2 Drillingmachine

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Posted 29 May 2016 - 11:25 AM

Power supply?



#3 RolandJS

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Posted 29 May 2016 - 11:30 AM

Power supply is probably being "told," signaled, to shutoff because of a short somewhere.  You've already tried the motherboard, power supply test?  And, beginning with one at a time stick of RAM, successively adding back one component at a time?


Edited by RolandJS, 29 May 2016 - 11:30 AM.

"Take care of thy backups and thy restores shall take care of thee."  -- Ben Franklin revisited.

http://collegecafe.fr.yuku.com/forums/45/Computer-Technologies/

Backup, backup, backup! -- Lady Fitzgerald (w7forums)

Clone or Image often! Backup... -- RockE (WSL)


#4 iceking77

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Posted 29 May 2016 - 11:39 AM

Power supply is probably being "told," signaled, to shutoff because of a short somewhere.  You've already tried the motherboard, power supply test?  And, beginning with one at a time stick of RAM, successively adding back one component at a time?

I have not, how should I go about testing the motherboard and power supply? And for the RAM you're saying that I just try booting my computer while adding another ram stick in each time I power it up?



#5 Drillingmachine

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Posted 29 May 2016 - 12:43 PM

 

Power supply is probably being "told," signaled, to shutoff because of a short somewhere.  You've already tried the motherboard, power supply test?  And, beginning with one at a time stick of RAM, successively adding back one component at a time?

I have not, how should I go about testing the motherboard and power supply? And for the RAM you're saying that I just try booting my computer while adding another ram stick in each time I power it up?

 

 

Tell power supply manufacturer and model first.



#6 RolandJS

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Posted 29 May 2016 - 04:04 PM

Yes, I forgot the term for this process, what you're doing is ruling in or ruling out each piece of hardware -- until the cause of the short is found.


"Take care of thy backups and thy restores shall take care of thee."  -- Ben Franklin revisited.

http://collegecafe.fr.yuku.com/forums/45/Computer-Technologies/

Backup, backup, backup! -- Lady Fitzgerald (w7forums)

Clone or Image often! Backup... -- RockE (WSL)


#7 Captain_Chicken

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Posted 29 May 2016 - 06:50 PM

Unplug all headers(power button, power led, etc.) one at a time until the pc boots.


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#8 MajesticFailure

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Posted 29 May 2016 - 06:52 PM

Bolstered by Yahoo Answers, i'd say, don't insert / remove RAM while power is on. It could destroy the RAM and mobo, plus your PC won't even recognise it until the next boot.



#9 MajesticFailure

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Posted 29 May 2016 - 06:54 PM

And don't breadboard (troubleshoot by adding components to a barebones setup on your desk) without CPU cooling, and do it on an insulating surface!


(there should be a big sign saying this on the forum, i feel)



#10 RolandJS

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Posted 30 May 2016 - 08:14 AM

Be sure you are properly grounded during all of this.  Some sources say:  with the power switch or toggle in the back OFF, one can leave the 3-prong cord plugged to provide a third ground at all times.  And, I was inferring that anything removed or added is only removed or added with the power toggle or switch in the back OFF.  I'm sorry for not posting the above at the very beginning.


"Take care of thy backups and thy restores shall take care of thee."  -- Ben Franklin revisited.

http://collegecafe.fr.yuku.com/forums/45/Computer-Technologies/

Backup, backup, backup! -- Lady Fitzgerald (w7forums)

Clone or Image often! Backup... -- RockE (WSL)


#11 iceking77

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Posted 30 May 2016 - 08:38 AM

Yes, I forgot the term for this process, what you're doing is ruling in or ruling out each piece of hardware -- until the cause of the short is found.

Ok great, makes sense. But how would I specifically go about testing the motherboard and power supply?



#12 iceking77

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Posted 30 May 2016 - 08:47 AM

Yes, I forgot the term for this process, what you're doing is ruling in or ruling out each piece of hardware -- until the cause of the short is found.

Switching out the ram worked! One of my sticks must have been dead. Thank you very much!






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