11-29-2009, 07:02 PM
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#1
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Farm Team Player
Join Date: Oct 2005
Exp: 
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Power supply issue
One of my old PC's has been sitting in the closet for about 6 six months. I tried to use it today and it wouldn't turn on.
When pressing the power button it powers up for a second and then shuts off. If I press the power button again it does nothing. Then if I turn off the power supply switch in the back and then turn it back then press the front power button again it will power up for a second then shut off.
When the power supply is plugged in I can get 8.6V from pin 9 (purple wire) and 8.2V from pin 14 (green wire). It is a 20pin atx connector.
Need a new power supply or might something else be wrong?
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11-29-2009, 08:27 PM
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#2
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#1 Goaltender
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Have you tried removing (and leaving removed) the CMOS battery?
__________________
-Scott
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11-29-2009, 08:29 PM
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#3
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Franchise Player
Join Date: Jan 2004
Location: Calgary
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Quote:
Originally Posted by KielC
One of my old PC's has been sitting in the closet for about 6 six months. I tried to use it today and it wouldn't turn on.
When pressing the power button it powers up for a second and then shuts off. If I press the power button again it does nothing. Then if I turn off the power supply switch in the back and then turn it back then press the front power button again it will power up for a second then shut off.
When the power supply is plugged in I can get 8.6V from pin 9 (purple wire) and 8.2V from pin 14 (green wire). It is a 20pin atx connector.
Need a new power supply or might something else be wrong?
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What kind of pc do you have?
__________________
Quote:
Originally Posted by Zulu29
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11-29-2009, 09:02 PM
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#4
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Farm Team Player
Join Date: Oct 2005
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Quote:
Originally Posted by sclitheroe
Have you tried removing (and leaving removed) the CMOS battery?
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Nope. Remove the CMOS battery and then try powering on the computer?
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11-29-2009, 09:05 PM
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#5
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Farm Team Player
Join Date: Oct 2005
Exp:
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Quote:
Originally Posted by jschick88
What kind of pc do you have?
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Gigabyte GA-7N400 motherboard, AMD Athlon processor, Antec True 380W power supply, etc.
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11-29-2009, 09:29 PM
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#6
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#1 Goaltender
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Quote:
Originally Posted by KielC
Nope. Remove the CMOS battery and then try powering on the computer?
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Yeah, its worth a shot because it'll take 30 seconds to test. I doubt it will change the symptoms, but it rules one more thing out.
__________________
-Scott
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The Following User Says Thank You to sclitheroe For This Useful Post:
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11-29-2009, 09:36 PM
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#7
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Franchise Player
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Your PS is most likely shot. Same symptons as my old PS that died.
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11-29-2009, 09:38 PM
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#8
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Franchise Player
Join Date: Nov 2006
Location: Supporting Urban Sprawl
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My guess is power supply as well. The only thing that says it *might* not be is you do get a bit of juice coming through when you switch the power supply off. However, I have no idea what it means.
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"Wake up, Luigi! The only time plumbers sleep on the job is when we're working by the hour."
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11-29-2009, 09:58 PM
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#9
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Farm Team Player
Join Date: Oct 2005
Exp:
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Quote:
Originally Posted by sclitheroe
Yeah, its worth a shot because it'll take 30 seconds to test. I doubt it will change the symptoms, but it rules one more thing out.
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Thanks for the suggestion but same thing happens with the battery removed.
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11-29-2009, 10:37 PM
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#10
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#1 Goaltender
Join Date: Apr 2009
Location: Back in Calgary!!
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I don't know the condition of your case or anything like that, but if something got in there that contacts the case with the motherboard it can create a short, and the power supplies protection features would shut it off right away.
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11-29-2009, 10:42 PM
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#11
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Atomic Nerd
Join Date: Jul 2004
Location: Calgary
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Hmm, an Antec Truepower should be more reliable than that.
Symptoms sound more like the PSU is detecting a short somewhere in the system and it's automatically grounding out.
It's either that or it's doing the ol' Gigabyte start-up and shutdown cycle because something is wrong with the motherboard or configuration.
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11-29-2009, 11:07 PM
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#12
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Franchise Player
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My dead PS would do that too. Start up for a split second and shut down. MemExpress confirmed it was dead at the time and was able to RMA it as it was still under warranty.
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11-29-2009, 11:35 PM
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#13
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Atomic Nerd
Join Date: Jul 2004
Location: Calgary
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Either way, PSU is the easiest to diagnose problem of any PC issues. Just plug another one in and see if it works.
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11-30-2009, 12:16 AM
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#14
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Farm Team Player
Join Date: Oct 2005
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Quote:
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Unplug the power cord from the power supply,short-out pins 14 and 15 on the power supply main power connector, and plug-in the power cord just long enough to see if the fan is working.
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Tried these instruction off a website and the fan did not turn on. I'm pretty sure the power supply is shot and its not a grounding issue.
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