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Strange Problem

I have a system that will power up for roughly 5 - 20 seconds and then the display goes off.
I can be in the bios or on the boot up screen and the display goes..... monitor light goes from green to yellow. Also the power supply makes a a noise like it kind of bogs down a bit and there is a light clicking sound (1-click only).
I tried another power supply also the system had integrated video but with an add in AGP card already there. I took the Vid card out tried another one... same thing. Took that card out tried the integrated card, same thing. Unplugged power to disk drive, CDROM, and floppy again... same thing.
The M/B is a MS-6349 Ver 5, Not sure of the CPU speed but it is an Athalon and the computer was built in 2001, Samsung HDD,CD Burner, integrated sound, PCI NIC and PCI modem, not sure how much RAM cause I can't see it quick enough before the screen goes blank.
One more thing.... the power supply in the system is a 350W the one i swapped out is a 250w. Either way there is no change in the behavior when I swap them.
What the hell is the deal???
Thanks
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D-DayRifleman

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Let see....

Ram: reseat and/or try different stick.
CPU: reseat, check cpu fan, try a different cpu. AMD's are heat sensitive.
MOBO: If all else fails, try a different mobo.
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HynesCo

what you have described your monitor doing and the 1 click sounds like the flyback coil on your monitor is going out.
I think the light click is the abrupt halt of the video signal. I suspect your AGP slot is bad.
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ASKER

THe clicking noise is from the inside the system. Also to clarify.... once the monitor goes blank there is still power to the computer. The fans are still running. It's almost like it is going into sleep mode. This monitor works on other systems, as far as the AGP slot.... as stated my first post, This system also has integrated video and the problem is the same using that.
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Case fans are powered separately from the motherboard, so that's not an indicator.  Did you take coral47's advice and check the cpu and the fan for it?  Most AMD motherboards automatically shutdown if they do not detect a working cpu fan plugged into the cpu header.
Have you been able to isolate the clicking to any particular device, perhaps the system speaker on mobo, etc. don't rule out AGP since integrated and slot are both on the same power source. If your drives continue to spins and the fans continue to spin, like Callandor states it has nothing to do with the 3.3vdc circuits for CPU, RAM, AGP.
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Well.... Oddly enough I fired it up and it now boots up and runs fine. I switched back to the original power supply just after to see if it would boot with that one. It does with that supply as well. It has been running for well over an hour.
Now what????
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More than likely a loose connection of some sorts which has now corrected itself via your trial & error.

>>> so don't touch it for now! <<<  LOL   Working on computers is soooo much fun!   : /

What aindelicato said.   : )
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Yes.... been using it all evening shutting down... booting up. No problems???
I had an Asus AMD board that would do as you describe. Every thing seemed to be working fine then pop it would quit. The system would boot and run for a bit sometimes days at a time without flaw. It would start acting up more often even at the point of checking the BIOS settings ( I have two small system users that may not know any better) I unplugged everything an ran the system with only the Vid, RAM and HDD. It would work long enough to give the indication those components worked (We all love intermittent problems, right).
This was a long process but I finally replaced the CPU with one from a friends working system along with his RAM and a new PS I bought. Same problem occured. the only saving grace was as the system digressed the shutdowns would happen more often making troubleshooting alot more palatable.
Because motherboards controls and effect all systems its hard come to the conclusion that a system on the MB is failing when everything else is working fine.
 
Watch if this problem progresses as mine did I would say one of the components on your MB is not very happy. My guess is the VM. Replacing the board is a good idea but know the VM works very close to the CPU, like suppling the nice clean power it need to run.
Ignore my last. It was misposted.
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