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Old 09-13-2002, 12:32 PM   #1
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Problem with new atx power supply

I have a Matsonic Mother board, MS-5025S which is an upgrade to my original board. The old AT power supply has been shutting down intermittently. The mother board has a 12 pin AT connector and a 20 pin ATX connector. I can not seem to get the new ATX power supply to work, it doesn't seem to power up. When I power up the old AT power supply (outside of the computer) the fan runs, with the new ATX the fan will not run. Is this normal? Am I missing something? A Jumper setting on the mother board?

I have read through the Mother board instruction manual and cann't seem to find any reason that this power supply will not work.

PS this is the second ATX power supply that I have tried to place into this computer. HELP!
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Old 09-13-2002, 02:21 PM   #2
Shiro Usagi
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Hi plban,

There should be a jumper somewhere on the motherboard you have to move to choose between the AT and ATX power supplies. Check the motherboard manual carefully...concentrate on the section regarding jumpers.

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Old 09-13-2002, 07:01 PM   #3
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There is an easy way to know if the ATX is not defective. Just short the green cable with one of the black ones using a metallic paperholder. The PSU should start.
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Old 09-13-2002, 07:32 PM   #4
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This was posted by Hpro and he included a picture. HTH

http://forum.pcmech.com/showthread.p...threadid=21246

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Old 09-14-2002, 11:22 PM   #5
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How are you trying to start the ATX power supply? There are a pair of posts on the motherboard that need to have a power button connected to, you can't just flip the switch on the back of the power supply.
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Old 09-14-2002, 11:27 PM   #6
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Yes you can, at least with all the PSUs I've tried that trick works.
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