Why do I hear no sound when I play files with RealPlayer for Mac OS X?
In RealPlayer for Mac OS X, if the file plays, but there is no sound, the file you are trying to play may be corrupt. First check that the RealPlayer volume is not muted or turned too low. Next, you can check your player by playing other files that are not corrupt. If your player doesn't play other files as well, try adjusting your computer's system sound configuration.