There is also some software that may allow you to set volume from your PC
My Display Software
My Display software can also be used to set the monitor for optimum viewing. Select settings for gaming, movies, photo editing, or documentation and spreadsheets. To install My Display software:
Insert the CD in your computer CD drive.
A menu displays.
Select the language.
Click Install My Display Software .
Follow the onscreen instructions.
Restart the computer.