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Old 08-31-2007, 05:09 PM   #1 (permalink)
Newb Techie
Join Date: Aug 2007
Location: Hudson, NC
Posts: 3
Default Random Powerup/shutdown loops

This is my first post. I built this computer over 3 years ago with no problems, other than replacing and upgrading the PSU about a year ago. I woke up 2 days ago and my computer was on (always shut it down) rebooting. Unpluged it and went to work, came home and fooled with it all night. Today and yesterday it would start up on its own and shutdown quickly but at random times...Some times before windows load screen it would shut off instantly. Other times it would load windows compleate and take 5 seconds to 4 minutes before it would actualy display windows is shuting down. What gets me is that it will randomly START on its own. After going through these random loops of shutdown and restart is seems to stablize and run fine. Yesterday and today it seemed to take about 20 to 30 minutes of this before it stays on.

I have serched and read through alot of posts in hopes of pinpointing the problem and done many tests of removing hardware and virues scans. I have not yet reset my BIOS or tested the PSU rails (left my multi-meter at work today...Doh!) Temps seem to be in normal ranges and even disabeling reboot after system failure does nothing (guess its not reading it as a failure). Being a mechanic, I am inclined to think PSU, but don't want to throw the $ at it if I am wrong.

Pentium 4 Pescott 3GB
FSB 800
Bus 200
Asus P4P800SE
Version 080009
Tansfer rate 8x
DDR 1024 (2 sticks)
Frequency 200.5
DX 9.0c
Gforce 6800 Ultra 256MB

Thanks in advance for any thoughts.

Skeeter35 is offline  
Old 08-31-2007, 06:49 PM   #2 (permalink)
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Join Date: Jul 2007
Posts: 122
Default Re: Random Powerup/shutdown loops

i would try a known good power supply. if it is faulting out and sending a power good signal to the mother board, it may be what's starting it on it's own.

Pentium D Dual core 2.8 GHz
Thermaltake Big Typhoon (CPU Cooler)
Radeon X 300 Series
Kingston 2 GB RAM
2 Seagate 160 GB HDD 7200
Thermaltake 500 Watt PSU
Sony 17" LCD Monitor
Thermaltake "Tsunami Dream" case
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Old 09-27-2007, 03:58 PM   #3 (permalink)
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Default Re: Random Powerup/shutdown loops

Took me a while to get the money and blow $50 on Newegg.com - TOPOWER XPT Series TOP-500XPT ATX12V 500W Power Supply 115/230 V UL, CE, CB, FCC, - Retail.
Soon as I started it up it did it repeated the problem...now it seems to log off less often and just shut off. But also seems to be more reliable when it is warm. Kinda thinking motherboard but willing to try any cheap tests before I scrap my trusty friend of 3 years.
Skeeter35 is offline  
Old 09-27-2007, 04:43 PM   #4 (permalink)
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Default Re: Random Powerup/shutdown loops

Have you tired to reinstall windows?
jay_bo is offline  
Old 09-27-2007, 06:05 PM   #5 (permalink)
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Join Date: Aug 2007
Location: Hudson, NC
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Default Re: Random Powerup/shutdown loops

Powers down before windows is even starting to load...definately seems more Hardware as I have noticed it more of a flicker and rapid power on and off when cold only.
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Old 09-28-2007, 03:15 AM   #6 (permalink)
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Join Date: Jul 2004
Location: Manchester, UK
Posts: 1,909
Default Re: Random Powerup/shutdown loops

PSU earth problems, needs replacement some wires have been shot and they are triggering on/off

Intel Core2Quad 2.66Ghz 12MB L2-Cache
4096MB DDR Kingston Hyper-X
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