GA-MA74GMT-S2 and HD6670 installation. Result: The Sound Driver is not found

[fpm]

Hello people,

I have a GA-MA74GMT-S2 with AMD Athlon II X2 255. I bought a HD6670 to have more grafic power but the sound now doesn't work. In Device-manager is the AMD High Definition Audio Device with an alert: The AMD High Definition Audio Device is not found.

when I deinstall the grafic driver, the High Definition audio Device isn't found. I downloaded the latest Realtek drivers from Gigabyte website link, and doesn't work. I disable the onboard sound card but without a positive response.

What should I do?

Thank you


Fpm

[absic]

Hi there,

What make is your HD6670 Graphics Card?
Which AMD Drivers are you trying to run for the Graphics Card?
What is the revision number of your motherboard and what BIOS version are you running?

[fpm]

Hi,

before HD6670 Card installation, it was wonderful. After the installation, the sound doesn't work. High Definition Audio Devices doesn't work. I disable the onboard sound and nothing. I install the next drivers from official Gigabyte website:

- Realtek Function driver for Realtek Azalia audio chip (v.2.62)
- AMD Chipset Driver (include chipset\sata raid\vga driver) (v. 8.641)


Computer:

Motherboard: GA-MA74GMT-S2
BIOS: Award Modular BIOS v6.00PG
Procesor: AMD Athlon II X2 255
Graphic Card: HD6670 PCI-Express 1Gb GDDDR5
RAM: 2Gb
Power Supply: 400W

Windows 7 64bits

http://imageshack.us/photo/my-images/269/screencm.jpg/ (in german)