CPU Fan twitches but does not spin

[Toontastic]

I'm building my first desktop and have had a mountain of issue. At this point I'm having an issue with the CPU Fan.

Prior to installing the GPU, the fan worked fine. After installing the GPU the fan only twitches (maybe making one Revolution per 5 seconds). I switched the fan port to another slot and it seemed like it helped a little. Now theres a 50% chance it will start spinning however even then it still starts twitching before finally spinning when windows boots. Other times it just continues twitching like it's trying to go and can't.

So far I have...

Tested without the GPU. This solved the problem.
Changed the fanport. Didn't seem to really fix the problem
Changed BIOS Cpufan settings, no change in performance or problem

I have observed...
The fan simply twitches when powering up. Sometimes it will finally get going when booting to windows, others it never gets going and I must power down to avoid overheating
The PC boots fine and powers fine. No other issues observed besides the fan refusing to work
Other case fans work
In BIOS as the fan twitches the fan speed monitor reports "1165 RPM" and constantly switching to "N/A"
The computer boots fine and will run fine (though I obviously don't try to with a nonfunctioning CPU fan) and does not report the CPU fan not working. It has 0 problems powering. The only notification is that fan going from 1165 to N/A

Specs are as follows
8 GB Ram
1 TB HDD
DVD RW Drive
Corsair 430W 80+ Builders series
Intel i3-2120 CPU
ASRock B75M Motherboard
Geforce GT430 (this part is reused from an older computer. It is the only reused part of the build)
Coolermaster 430 Elite case
Two 120mm case fans


Please, help. I'm at a loss now and aside from RMAing a random suspect part, I don't know what to do. I have no problem RMAing a faulty part, I'd just rather be as close to certain that what I send back is the issue, instead of taking a shot in the dark.

[Murf]

Sounds like either the fan itself is bad or the wires running from the fan are loose or shorting out. If you tried two different motherboard headers for the fan and the same symptons then I would suspect the fan. If you can get a 3/4pin to molex adapter and plug the fan into one of the power supply power connectors and it works fine then I would then suspect the motherboard headers. Or if you have another fan that has the 3 or 4 pin wire plug it into the headers and see if it works.

[Toontastic]

Originally Posted by Murf

Sounds like either the fan itself is bad or the wires running from the fan are loose or shorting out. If you tried two different motherboard headers for the fan and the same symptons then I would suspect the fan. If you can get a 3/4pin to molex adapter and plug the fan into one of the power supply power connectors and it works fine then I would then suspect the motherboard headers. Or if you have another fan that has the 3 or 4 pin wire plug it into the headers and see if it works.

I believe I have an adapter on hand somewhere so I'll go digging for it. But just wondering, is there any chance the PSU is to blame? Since the issue really only happens in full when the GPU is plugged in. When it isn't, the problem mostly disappears.

[Murf]

GPU=Graphics Processor Unit are you referring to the Graphics card (Geforce GT430)