I have this EXACT issue
P67A-UD4-B3.
Akasa Apache Black
Sys_Fan2
Fan spins on boot, 5sec spin, powers down, and twitches non stop all the time, won't spin in any circumstance!
Called Gigabyte tech and they said no problem, RMA the board and we'll sort it..
I thought HMM?! Shouldn't need to be done as this seems like it's an issue with some firmware or voltage going to that header.
I've just rebuilt my system (can be seen in pictures of members computers thread), and i've bought a load of new fans, only to be sadly disappointed that I can't use a SINGLE FAN in my system how I want to use it.
They're all 4 pin connectors, my board has Cpu fan, Pwr fan, Sys fan 1, Sys fan 2, cpu and sys fan 2 are 4 pin, pwr and sys fan 1 are 3 pin, you can't connect a 4pin to a 3pin as it'll spin at full speed constantly which is not what I want, I want it plugged into 4 pin, and to be controlled by the motherboard, but this obviously can't be done??
I'm yet to find a fix to my issue, can't connect cpu fan to a 3 pin connector (can I???) (Noctua NH D14 with dual HS + Fan, using splitter onto cpu fan header to run both fans), can't run any of my fans off the 3 pin headers as they spin at full speed, can't use the only 4 pin either...
Now. Is there a fix to this? Is there a fan I can buy that's SOOOO quiet you can't hear it? I originally went with the Noctua S12B ULN fans but the nice chaps at Scan.co.uk recommended the Akasa Apache Black's which don't come with any screws or ANYTHING. So is there 3 pin fans I can buy that are silent as a dead doormouse? Here's a link I've found useful:
http://www.quietpc.com/gb-en-gbp/products/120mmfans then arrange it by DBA.
Can I get slow spinning, high(ish) airflow, quiet fans, to run from my 3 pin headers, or any that will work on my sys fan 2 header? I've got like one day left to return these akasa fan's back to Scan.. So any help ASAP would be brilliant fellas! (I'm clued up on what i've done before, but this is my first gaming rig with loads of fans, so not a clue! Google is my best friend lolz)
TA! MiiCK