I have a 2011 17" Macbook Pro and have connected my DVI to HDMI and into my new Sharp Aquos Quattron and cant get any sound. To be more specific when I connect my cable to the computer and then to the TV and then go into my system pref's on the "Monitor" category its seeing my TV but when I click on "Sound" its not seeing my TV in both the "Line Out" and "Line In" I went into the "Audio MIDI" setting in my utilities to see if it would fine the TV there and no luck. On most of my friends computers you plug in the cable and the switch is basically seamless. The computer screen basically shuts off and the control is not on the TV which does not either seem to be the case with mine though I can someone, dont recall how I made this work but can get the images on my TV. Not to sure if this has anything to do with it but I have noticed a few times in the past month or so that I will turn my computer on and not be able to turn the volume up or down on its external speakers. The only way to get this to work is to plug in a pair of headphones, turn the volume up and down and then disconnect them.