I recently changed my mobo from a gigabyte GA-K8N51GMF- 9 to a ECS A939 nforce 4, the processor was changed as from a athlon 2.2 to a 2.4 as well and 2 gb of ram was added, the hardrive was the same, the computer booted up straight away no problems except the sound, i've recently formatted my hardrive, reinstalled windows checked windows services and bios sound and still no hope , the drivers installed fine and the one the that installs through windows update in a nvidia one, but i've also tried the realtek ac97 and its still not working, im wondering if there are any deep seated files that may be conflicting with my drivers. Any help would be really appreciated!!!