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ATX 20+4 pin problem

post #1 of 3
Thread Starter 
Mobo: http://www.gigabyte.com/products/product-page.aspx?pid=3646#sp
PSU: http://www.coolermaster.com/product.php?product_id=6662

I'm putting together a new build and ran into a bit of a problem. My PSU has a 20+4 pin ATX connector, which I obviously would plug into the ATX slot on my mobo. The main 20 pin connector fits and snaps into to place fine, however, the +4 connector does not. It does not snap into place at all; it only takes a small tap for it to fall out.

Anyways, I tried booting my machine and it starts for a few seconds, the ACPI light turns red and it restarts and then the process repeats until I turn it off.

So, I'm assuming that the problem is related to the poor connection, thus the ACPI is indicating a lack of power. Tomorrow I'll try plugging the psu into another computer to find out if the problem is the ATX cable or moboslot.

In the meanwhile, if anybody has any suggestions or previous experience with such an issue, I wouldn't mind hearing about it.

Thanks
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HAFinator (WIP)
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post #2 of 3
I also have a 20+4 ATX plug, but in my board I have to hold the 4pin close to the 20pin upon pluggin in so that it actually enters. I have plug the 20pin before the 4pin then it's impossible to shove in the 4pin. The 4pin doesn't have any clip, it's held in by friction. If it pops out then either the psu plug or the motherboard plug have wore down or they are faulty. If you had a multimeter you could just measure the resistance between the beginning of the ATX plug wire (in PSU) and the soldering point of the ATX plug on the back of the motherboard.
As a test I advice you this: first of all check if the plugs on the motherboard and the PSU are in a good state or they are damaged; if all is well try not plugging the 4pin at all, plug only the 20pin and see how it goes , if it boots or not; then also plug all the 20+4 in the board and fix it somehow (duct tape, etc) and see if it boots.
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Centurion
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post #3 of 3
Thread Starter 
Quote:
Originally Posted by dragosmp;13363557 
I also have a 20+4 ATX plug, but in my board I have to hold the 4pin close to the 20pin upon pluggin in so that it actually enters. I have plug the 20pin before the 4pin then it's impossible to shove in the 4pin. The 4pin doesn't have any clip, it's held in by friction. If it pops out then either the psu plug or the motherboard plug have wore down or they are faulty.
You are indeed correct. It just required some awkward handling to hold them together while plugging in it. However, the reboot cycle problem still persists.
Quote:
Originally Posted by dragosmp;13363557 
If you had a multimeter you could just measure the resistance between the beginning of the ATX plug wire (in PSU) and the soldering point of the ATX plug on the back of the motherboard.
I do have a multimeter, but I'm not terribly confortable with it. What would I set the resistance to? What number should I be looking for; what indicates a problem? Would this just tell me if there is a problem, or could it specifically indicate what device is the problem?
[/QUOTE]
Quote:
Originally Posted by dragosmp;13363557 
As a test I advice you this: first of all check if the plugs on the motherboard and the PSU are in a good state or they are damaged; if all is well try not plugging the 4pin at all, plug only the 20pin and see how it goes , if it boots or not; then also plug all the 20+4 in the board and fix it somehow (duct tape, etc) and see if it boots.
Visually everything appears to be fine. I tried with and without the 4 pin, and there was no difference. Nothing else is plugged into the mobo besides the ATX cable and the processor, with the CPU water block mounted.

If I use a metal wire to short the PSU to start it, it seems to work fine. I connected my water pump and fans too it and it seemed fine.

Thanks!
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HAFinator (WIP)
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Intel 2600K Gigabyte P67A-UD7-B3 EVGA GeForce GTX 560 Ti SLI 8GB G.SKILL Ripjaws 1600 
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Intel 320 80GB, WDC 1TBx3 Lg GH22NS50 Black 22X Sata Dvd Writer Windows 7 Ultimate 64x ViewSonic 23", Samsung 19" 
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Logitech G15 Gen1 Coolermaster Silent Pro Gold 1000W HAF X Logitech MX 518 
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