If you want to achieve a quieter desktop computer and you can't control the speed of the fan manually through software, such as 'Speedfan', then as an alternative method, you can reduce the voltage the fan gets to 7 volts, instead of 12 volts. This will make the computer fan permanently spin slower, therefore it will create less fan noise. This mod is safe to do, plus it is better than the 5 volt mod because at 5 volts the fan spins really slow, too slow to cooling things down, causing overheating problems and this modification won't damage any components in computer, if you are wondering.
Instructions:
1) Remove the computer fan's connector from the motherboard and snap it off from the middle, as you won't be needing it anymore.
2) Get a wire stripper and remove the plastic insulation coats of the the positive and negative wires from the fan. The computer fan is very likely to have another wire, if it has a 3 pin connector, which is used for the motherboard to detect the rpm speed, you won't need this so cut it off.
3) Find a spare molex connector inside your computer, it's easy to find, it's a connector with 4 pins, that comes out from the power supply. You will see loads of them connected to different stuff, like a hard drive and DVD drives.
4) Once you have found it, cut off two wires that go into the molex connector, which are a yellow wire and a red wire.
5) Once you have done that, remove the insulation coating off both wires and connect the red wire from the fan to the yellow wire and the black wire from the fan to the red wire.
6) Use insulation tape, to tape up exposed braid from the connections you have made, if you don't they can touch other wires and cause damaged to the psu.
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