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Computer Shutting Down


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#1 MrMeatLoaf

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Posted 24 September 2009 - 07:14 AM

My computer will spontaneously shut down even after literally a second of being on, but will sometimes stay on for days at a time.

I've tried the following:

Removed all peripherals/ram etc. leaving only the mobo, cpu and psu.
3 different psu's
2 different mobo's
2 different cases's (incase the case was causing a short)

I tried re-seating the cpu multiple times and re-applying the thermal paste.

Air flow problem? well I tried pointing one of those 24" fans into an open case. Same problem.

The only thing that works is taking everything out of the case. I can have all peripherals attached like this and it will run fine. Once back in the case the problem continues. Again, I've tried 2 different cases.

One thing that will work more often then not, is touching the case while having my feet on the carpet when I turn it on. But it will eventually shut down. Could my house not be grounded properly?

I'm at a total loss, any suggestion would be helpful.

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#2 Sunharrow

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Posted 24 September 2009 - 08:50 PM

Check to see if your motherboard is not touching your case or wires anywhere.

#3 starcraftmaster

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Posted 24 September 2009 - 10:19 PM

if you got spare ram
then maybe you can try that to see if the ram is good still(you can try one of thoese ram testing programs but the computer may turn off like you say)

#4 Daybreak

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Posted 24 September 2009 - 10:29 PM

Could be either a loose wire or a short somewhere.

Maybe the 'on' button wiring is loose and any type of vibration like putting in a cd activates it, shutting you down.

Check your wiring first before you go gutting your rig or replacing peripherals.

#5 MrMeatLoaf

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Posted 25 September 2009 - 07:10 AM

Check to see if your motherboard is not touching your case or wires anywhere.

I thought this too, so I threw on those red fiber washers and didn't screw in the mobo. Same problem. Then as test, I bought rubber washers that are about 2mm thick to "lift" the mobo incase it was touching somewhere. Same problem.


if you got spare ram
then maybe you can try that to see if the ram is good still(you can try one of thoese ram testing programs but the computer may turn off like you say)

I ran the computer without any ram, same problem.

Could be either a loose wire or a short somewhere.

Maybe the 'on' button wiring is loose and any type of vibration like putting in a cd activates it, shutting you down.

Check your wiring first before you go gutting your rig or replacing peripherals.

That was something else I thought as well. So I disconnected all the wires and turned it on with a screwdriver. Same problem.

#6 starcraftmaster

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Posted 25 September 2009 - 07:17 AM

computer wont turn on with out ram
so do you have any spare ram?

#7 Daybreak

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Posted 25 September 2009 - 09:26 AM

I'm sure you've probably already checked this but, is your cpu fan working when this happens?

An overheating cpu will shut a computer down everytime.

#8 Daybreak

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Posted 25 September 2009 - 09:28 AM

Could be either a loose wire or a short somewhere.

Maybe the 'on' button wiring is loose and any type of vibration like putting in a cd activates it, shutting you down.

Check your wiring first before you go gutting your rig or replacing peripherals.

That was something else I thought as well. So I disconnected all the wires and turned it on with a screwdriver. Same problem.


Did you leave the wiring disconnected after you started it with the screwdriver and it still shut down on it's own?

#9 MrMeatLoaf

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Posted 26 September 2009 - 08:05 AM

computer wont turn on with out ram
so do you have any spare ram?

The computer will turn on without ram; it just wont get very far... but it's still "on". However, it will still shut off randomly.


I'm sure you've probably already checked this but, is your cpu fan working when this happens?

An overheating cpu will shut a computer down everytime.

The fan does work. The heat sink itself is made of aluminum, but it has copper heat pipes. So it's not the greatest in the world, but should be more then adequate for this particular cpu especially since I'm not over clocking it. However, the computer could be off all night, then when you turn it on in the morning it could still shut off after only a few seconds... long before it has time to heat up.

Did you leave the wiring disconnected after you started it with the screwdriver and it still shut down on it's own?

I did leave the wiring disconnected. I even tested each screw individually encase one of them was causing a short.


Thanks for all of your suggestions guys/gals. :thumbsup:

#10 Daybreak

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Posted 26 September 2009 - 11:08 PM

Well you've eliminated the psu, mobo and case.

All that's left really is the cpu. Do you have a different one you can test?

#11 PlyPencil

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Posted 28 September 2009 - 01:37 PM

Sounds like a CMOS problem, how old is your mobo? and what make?

#12 Daybreak

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Posted 28 September 2009 - 06:55 PM

He said he already tried two different mobos.

#13 syscorpsecure

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Posted 28 September 2009 - 07:13 PM

Have you tried the power switch on the case to see if the built in fuse is bad?

There is a fuse behind the power switch which prevents the user from shorting out the motherboard in case voltages get out of synch. It also allows you to discharge any voltage built up on the motherboard by holding the switch in for 5 to 10 seconds with the AC current removed from the system.

#14 Sneakycyber

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Posted 28 September 2009 - 10:53 PM

Well since you have tried switching everything in the computer I would have to suggest try switching the house :thumbsup: . There may be a problem with the wiring.

Chad Mockensturm 

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Certified CompTia Network +, A +


#15 Daybreak

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Posted 29 September 2009 - 04:34 AM

Yeah, definitely test your power source in this case.

Simply use a multimeter, or if you don't have one try plugging your rig into a different outlet somewhere else in the house.




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