My chassis fan stopped spinning after a reinstall of Windows 7 32bit today. I did spend quite a bit of time trying to tweak power management settings, however I've reverted all to default and still I cannot get my chassis fan to work while in windows any longer.
Pre-reinstall, it worked fine, even when the computer was in sleep mode. Now, no longer. When I reboot, and BIOS has control of the board, the fan spins up. As soon as Windows loads, it shuts off. This is going to cause a huge problem as I've got a fanless video card (AMD HD 6450), which got up to 108C due to no moving air.
MB: Asus P8H67M-LE OS: Windows 7 Ultimate 32bit
Those are the only relevant pieces of info I can think of.