I just picked up a used monitor a few days ago, that has a volume knob and mute button on the front of it, and I can't seem to figure out how to make them acctually do anything.

There is only one jack on the whole thing (mic out), and I tried to download the drivers from the manufacturer (compaq), but the installation file dumps me back to a prompt just before it starts extracting things (downloaded it again, same thing).

Any suggestions?