ATX 4 pin issue

Hewlett-packard / M1080n
January 22, 2009 at 10:42:56
Specs: Windows XP, 512 MB
The computer wouldn't come on. I have done some trouble shooting and come up with this:
The power supply seems good. It wouldn't come on so I tracked it down to this:
--With everything plugged in, no light or fan on the power supply. If I disconnect the 24 pin adapter from the motherboard, the green power light comes on, only. If I reconnect the 24 pin and disconnect the atx 4 pin from the motherboard, power lights and fans come on.
I can't find out what that plug does or how I can fix this issue short of changing out the motherboard. Am I correct?
What else can I do?
Your help is appreciated!!!
THank you
Wanda

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#1
January 22, 2009 at 14:21:50
The square ATX12V 4-pin plug supplies power to the processor.

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#2
January 22, 2009 at 15:33:06
Thank you for answering.
so this is probably telling me the processor is bad, correct?
If so, better to just change the processor. It is an intel pent 3.2 GHZ.iM/800, SL7j7 hyperthreading.
I can't seem to locate one that is not an arm and a leg! Unless it is used...Not sure that is good. I can't find anywhere that tells me what I could replace it with that would be comparable.
Ideas anyone?
THANKS!!!!

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#3
January 22, 2009 at 15:49:37
jam said it supplies power to the processor, not that the processor is bad. In addition, your processor uses about 7 amps of 12 volt power...that's quite a bit.

I'd suspect a failing power supply...is it a Bestec 300 watt with 19a on the +12v rail?

Skip


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#4
January 22, 2009 at 20:01:41
Well, I maybe should have worded that different.
But I understand what you are saying. I do have another power supply. So I will give it a try and see what happens.
If you have other thoughts, please let me know.
Thank you.

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#5
January 23, 2009 at 05:57:28
ok, I plugged in a new power supply. Again, the same thing. If I plug in the 24 pin on the motherboard and leave the ATX unplugged, the fan on the power supply comes on. I plug in the ATX and the fan on the power supply does not come on.
Ideas?
THANKS
Wanda

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