No Sound when Using HDMI from ATT DVR to TV

I have a 52xv645u TV. When I connect it to my ATT UVerse DVR using HDMI I get picture but no sound. Using Composite everything works fine. I've tried several HDMI cables. If I use HDMI to my Surround Sound amp, I get both picture and sound (even with the amp volume muted). The problem seems to be the connection between the DVR and the TV. Does this TV support HDSC? I believe that the DVR requires it to support it on the TV.
I see that there is an upgrade for the firmware for this TV. I have a Mac so the instructions don't work right. I've downloaded the files to a flash drive but I am not sure if they are correct because there is no list of files available. Does anyone know what files are needed so I can be sure that my flash drive has everything it needs?
Any help with these problems would be appreciated!
Thanks,
Mark

Is there a list of things that are fixed in the update? I can get sound and picture through component but I fear that it's not the same quality as it would be through HDMI. But again, it's only when I watch TV without going through my surround sound amp. I can watch TV through my apm and watch my Bluray DVDs through the amp and it goes via HDMI.

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Please try this first to enable Speakers in Playback devices as follows:
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Regards.
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Make it easier for other people to find solutions by marking a Reply 'Accept as Solution' if it solves your problem.

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**Click the KUDOS thumb up on the left to say 'Thanks'**
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