I've been wiring up some standard 80mm and 120mm fans directly to a 9v power supply. The 80mm were marked red, black and yellow but the larger cheap 120mm fans I got (mistake) are all black and I need ...

I'm stuck. Just putting together a new system and all I have are 3 wire fans for the heatsink. The CPU fan connection on the motherboard is a 4 pin thingy.<br>I can plug in the 3 pin connector but the ...