My father just got a Mac Mini (first mac) and is using it connected to a TV through HDMI. The problem is that we can´t control the sound neither on the desktop icon (its grayed out) nor with the keyboard (apple wireless keyboard). We can control the sound just fine with a TV remote control, so the problem isn´t on the TV itself and we can also change the volume on iTunes. Does anyone know how to solve this? Thanks in advance.