I have updated by driver to 8.3 but I think what might be happening could be the fan just craps out. Would it be possible that an exposed jumper prong in contact with the fan wire could be somehow shorting it out, the fan wire is not damaged and I'm no expert on electricity and what not, although i do know a thing or two 
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Q6600 overclocked @ 3.0 Ghz | 1.35v
Thermaltake Blue Orb II Heatsink 120mm fan | Idle 18*c / Load 30*c
Asus P5K | LGA 775
G-Skill 2 x 2gb DDR2 1000 Mhz
Ati Radeon HD2600 Pro 512mb Coming Soon, Geforce 9600 GT KO GDDR3 1.9 Ghz
Antec 900 | 1 x 200mm + 4 x 120mm fans
Gusty Ubuntu 7.1 + Vista x86 Ultimate + Fedora 8
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