Ive got a Sapphire HD4830 and started messing with low level fan control to quiet the thing down. At first, after proper power user settings enable, I was able to shut off the fan putting it at 0% duty cycle. There was a big difference in fan speed and noise between 0% and 1% so I decided to shut it off until 60*C. Everything was working until I played maybe too much with the others fan settings and rebooted. After that the 0% duty cycle was still showing on monitor but the fan do not shut off, making still a lot of noise. Ive tried and uninstalled Rivatuner, rebooted, defaulted the settings, but still, 0% duty cycle did not shut off the fan as it used to do. Maybe I need to reset bios settings ? How can I do that ? Any other solutions ? Thank you !