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PostPosted: Thu May 12, 2016 7:54 am 
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Black Belt
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Hi!

Everytime I plug in the 4-pin power socket on the motherboard for the cpu, the pc does not start. When I unplug the cpu 4-pin on the motherboard, everything is fine. The fans run at their at their normal speed (led and gpu). Obviously, there is no post since the cpu is unplugged.

I suspect that there is a short circuit in some component in the cpu voltage control area but I don´t know what exactly look for

any clue?

the board is intel d101ggc rev 1.03

many thanks in advance

SAMH

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PostPosted: Thu May 12, 2016 3:24 pm 
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Mobo-fu Master
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The plug on small fans is polarized to mate only one way. The 4-pin header is universal to 2-pin, 3-pin and 4-pin fans.
The BIOS monitors the fan RPM as part of the POST process, if it spins up, or not. No spin, then a critical error that halts the starting sequence. Should be a small tab on one side of the header, so the plug goes on only one way. If missing, the plug could be connected in reverse! Some headers are made with a tiny box in place of the tab.
Check the wiring on that fan.. should be a red and black on one end, for the +12 volts to the motor. Black is negative, red positive. Try a 9 volt battery with thin pins (or straightened staples) in the plug to check operation.
This link notes the typical wiring colors, and the function of each pin..
http://www.allpinouts.org/index.php/Mot ... _4_Pin_Fan

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PostPosted: Thu May 12, 2016 11:47 pm 
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Enlightened Master
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Also check for bad capacitors...

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PostPosted: Fri May 13, 2016 6:55 am 
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Black Belt
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Karl, the culprit is not de Fan cable is the CPU 12 V power cable, 4 pins, two yellow two black

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PostPosted: Fri May 13, 2016 4:29 pm 
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Mobo-fu Master
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:oops:
Quote:
..4-pin power socket on the motherboard for the cpu..

Guess I flubbed that one! Mind was somewhere else, not in the present!
That 4-pin plug is polarized so it connects only one way.. could be only two wires (one yellow, one black) or four wires (2 each color) to the plug. That is a required secondary power source for the CPU.
Mr T has a good point.. check for bad capacitors. Any that are domed, lean excessively or show sign of leakage are bad. More info at www.badcaps.net/
By the CPU are small voltage regulators.. about 1/2 inch square or so, 3 or 4 leads. Any that look 'toasted' have failed.
Would be good to know more info about the setup..
CPU type, PSU type, memory type, storage and optical drives.

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PostPosted: Fri May 13, 2016 6:35 pm 
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Black Belt 1st Degree
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Modular power supply? If so check you are using the right lead for that supply. I unwittingly blew up a nice corsair ax860i as i used lead from another psu! If you have a voltmeter yoh can use it to checkbthat the yellow wires are +12v and black gnd.

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PostPosted: Fri May 13, 2016 9:51 pm 
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Mobo-fu Master
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Not everything is fine if not using the 4-pin as you still have no POST then.

Did you change the CMOS battery with a brand new fresh one?

What power supply are you using and did you go back to the absolute minimum of power supply, board, CPU + fan, outside the case? If so, does it beep when you try to start it with something metal on the power switch pins of the board?

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PostPosted: Mon May 16, 2016 11:35 am 
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Black Belt
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the PSU in a normal ATX/2 type 485 Watts and I tested it in two other system, one of them with the same brand / model MOBO and the PSU works fine

I´m using the minimum PSU + Board + CPU (2,93 GHz celeron D) and 1 x 256 ADATA DDR1 known good RAM for testing purposes.

when I try to start it touching the power switch pins of the board the CPU Fan only turns on briefly and instantly stops. the same happen when I try to starts the PSU by joining the green and one black cables. when I remove de +12V CPU power 4 pin cable the the CPU fan starts by any of the two methods

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PostPosted: Mon May 16, 2016 4:25 pm 
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Supported processor types for that board with BIOS version:
http://www.intel.com/content/www/us/en/ ... 05728.html
Memory types: (Note the mention that modules must be 2.5 volt type.)
http://www.intel.com/content/www/us/en/ ... 06502.html
Quick reference link:
http://www.ascendtech.us/intel-d101ggc- ... 01ggc.aspx
Normal for a CPU or other device fan to turn on briefly when powering up, part of the BIOS check.
But no CPU activity, no POST process.

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PostPosted: Tue May 17, 2016 5:24 am 
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Black Belt
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the setup is fully compatible. it was working fine. I just replaced the HDD (13GB) for a bigger one (80GB) and when I was installing XP the computer suddenly shuts off and never starts again

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