Motherboard will not power.. help pleease

Sell224

New Member
I am still working on this same problem I had a week back..

I am building a computer with an asus a8n sli-deluxe mobo, x1900xtx, amd 3500+, and a cheap 350 watt power supply (Thermal Master). Yes I know the power supply is really bad and should have gotten a better one, but I really want to try to make it work before I go out and spend a hundred bucks on a new one.

My problem is as follows:
I can get power to all the fans if I plug in just the 20 pin connector. If I plug in the four pronged extension to the 20 pin (the psu is cheap, so it only has a 20 pin connector when the mobo has a 24 pin connection) I can still get power to all the fans. (case fan, cpu fan, gpu fan) I plug in the video card power, (6 pronged connector) and everything still works the same. The entire time I am getting the two led red lights on my GPU which suggests I am not getting enough power, which makes sense, but I am still getting the fans to turn on.
Now I move on to plug in the four pin connector near the cpu fan, which is supposedly necessary to power the motherboard. I plug that in, turn on the power supply, and NOTHING. Actually, I do get a green LED light on the mobo to turn on, so I know I am getting some power, but when I try to power on the fans will not turn on.


I have been trying to figure out forever why this is happening, and it is so frustrating. I have no other power supplies to test with, so I can't determine for sure whether it is a power problem. Is there any connection between the computer not getting enough power and the 4 pronged making the whole thing not work?? Another thing might be that that 4 pronged is somehow broken, and plugging it in screws up the whole system from working.


PLEASE HELP!! I need this computer for work and I just can't get it to work. My next step would be to go out and buy a 500+ watt power supply, but that'l be pricey.
 
Try taking the motherboard out of the case and trying again to make sure nothing shorts. I had the exact same issue with an A8N-SLi and an X1800 card with the LED's and it turned out that my PSU had blown the voltage circuits in the motherboard.

So best of luck :)
 
ahhh I fixed it. I took everything out and I am pretty sure the problem is that I had one of the connecting heads bellow the motherboard in the wrong slot, and it was pushed up against the bottom of the motherboard near the 4 pronged connector. Moved that thing and it seemed to have fixed it all. Wow.. small problems like that are always so annoying to find. I'm pretty sure the metal somehow just shorted the mobo and didn't allow the 12v to work. Thanks for the suggestion.
 
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