mobo : MSI 990FXA GD65PROCESSOR: AMD FX6300CABINET: COOLER MASTER K380EVEN THOUGH ALL MY AUDIO FILES ARE INSTALLED I CAN

ykki

Honorable
Do you have realtek installed? If no then install it.
If yes then open it. In the speakers tab look at top right there will be a folder icon. Open it and check the first option.

Other than this are the audio headers connected properly in the mobo?