I will repeat the post from anothe thread:
There is no way of getting sound over HDMI. It only works out of the analog sound.
You can still use the video part from HDMI and then select the analog sound input in the TV set.
* Download the AppleHDA audio driver:
RapidShare: 1-CLICK Web hosting - Easy Filehosting
* Drag the alc885dump.txt on the AppleHDAPatcherv1.20 and wait till the patching is finished.
**** Do not run AppleHDAPatcherv1.20!! simply drag the codec onto the AppleHDAPatcherv1.20!! ****
Reboot and select internal speaker in the preferences.
It works for Tiger and Leopard. The volume and quality works great for me, it is not low at all.