I connected my MBP via HDMI to my TV. When I do this, my MBP's volume button increases the volume but my TV's volume does nothing. How can I fix this problem? I am playing media using XBMC. Yesterday it worked perfectly. When I put my MBP in via HDMI, I could not longer change the volume using my MBP's F11+F12 buttons, I had to use my remote or the audio control in the program!