[Da_Bian]

My comps just over a year old now, and I've removed every fan and WD40'd them all due to excessive noise / 'howling'. (CPU Fan, Vid card Fan, Exhaust, Inlet etc....every one of them)

Take the fan out.
Remove the sticker on the back. Keep the sticker, as you want to put it back later.
Sometimes there's a small rubber round thing under the sticker, rip it out and put it somewhere safe, you'll want to put it back later too.
Squirt WD40 or even sewing machine oil in there. Not too much as to make it drip everywhere.
Spin it as fast as you can. It's fun.
Wipe up all the excess WD40 or oil.
Replace the round rubber thing.
Replace the sticker. If your sticker won't stick back, just use masking tape (the white paper stuff), instead of the sticker.

Throw the fan back in and congratulations you've saved some money and had some fun! freak: