MiniDP port doesn't play sound via HDMI

I have connected it from the computer to the HD tv, and the video works. But the sound will not transfer, The sound preferences doesn't show any outputs but the internal speakers, and I checked the MIDI setup Utility, and it also did not show it as an option.

Hi, guidino. I have a late-2008 unibody MBP like yours, and I don't expect Apple will ever enable our mini-Displayports to output audio signals. But there are adapters that will combine audio and video signals from our machines into a single HDMI cable and resolve the problem you describe in your post. Here are three:
This one draws 5.1-channel optical digital audio from the headphone port and power from a USB port:
http://kanexlive.com/products/item.aspx?id=3495
This one draws 2-channel stereo audio from a USB port:
http://kanexlive.com/products/item-id-3323.html
This is similar to the first one linked above, but less expensive:
http://www.cablematters.com/pc-56-26-mini-displayport-male-and-toslink-audiousb- male-to-hdmi-female-adapter.aspx
I don't know where you are located, but you should be able to find these adapters or similar ones somewhere near you, or at an online vendor who ships to your country.

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