No sound on A770M-A

Hi Lyubomir, there are a few things I'd like you to check. It's always suggested to clear the cmos/bios after purchasing a new board. The Mfg, make changes in the bios & they do not clear the bios when they finish. So please reset your cmos/bios jumper pg. 9, in your manual. Boot system & enter bios. Go over your settings & change as needed. When you come to Plug & Play OS choose No. This allows the bios to place IRQ's instead of windows. Also make sure your Onboard AUDIO Function is set to, (Enabled). When fiished save & exit bios. Double check pg. 43 for information spec's for the HD audio driver.
Try installing sound software again. If it still fails or barks the same error message try installing through device manager & point windows to the correct driver folder & OS located on your ESC driver CD. If it still fails. Run windows update untill there are no updates left for software or hardware.
Your link to ECS for A770M-A PCB:1.x
Suggest you save this link in your favorites.
http://www.ecs.com.tw/ECSWebSite/Products/ProductsDetail.aspx?detailid=844&CategoryID=-1&DetailName=Specification&MenuID=1&LanID=0

Please let me know how things work out!
Luck!

Mike