After installing a new motherboard (the other sparked) my CPU fan runs at max speed constantly (around 5200rpms). With my old ASUS mobo the fan would run full speed in the BIOS but slow down as it entered Windows. My friend told me i had to flash the BIOS but i have no idea how to(?) My PC: AMD Athlon 64 3200+ 2.2 ghz ESC K8M800-M2 (http://www.ecs.com.tw/ECSWebSite/Products/ProductsDetail.aspx?DetailID=455&CategoryID=1&DetailName=Feature&MenuID=48&LanID=90) 1.5GB DDR Ultra X-Connect 550watt PSU ATI Radeon x1650 PRO Sound Blaster Xfi- Xtreme Music
I'm not sure that you need to flash the bios... You should certainly take a look at the settings in your bios, because it could be set to a manual speed rather than automatic. Also, if you do decide to flash the bios (usually done to add functionality or repair a corrupted bios), be very careful.