Viewsonic VX2453MH-LED Display Works, but no sound from monitor

I'm using 15" MBP (early 2011), OS X Lion, and I saw earlier threads about this disaply not working (vertical bars). I figured that part out, but am having trouble with no sound coming from the built-in speakers. I have a Moshi HDMI adapter and ViewSonic's HDMI cable. I have no sound, though, and I even put in their supplied audio cable into the headphone jack, which didn't work. Maybe I need s/t else? I love the monitor and not having the sound won't kill me, but I did get it because it was primarily integrated into one whole unit. Thoughts would be greatly appreciated! Btw, called Viewsonic and they were no help.

After I click on playback devices and bring up the Sound window, I can see the monitor icon with the label Realtek HDMI Output, as well as icons for Realtek Digital Output, Speakers, and Headphones. Speakers and Headphones are greyed out since they are not plugged in. Realtek Digital Output is not greyed out and says Ready. The monitor icon is also not greyed out, has the check mark on a green circle background, and is marked as the Default Device. Since it is already set as the default device, the Set Default button is greyed out. When I double click Realtek HDMI Output and open the Realtek HDMI Output Properties window (Item 6 on the checklist) and click the Supported Formats tab (Item 7), there are no check boxes next to the choices under sample rates, but the various rates are there: 44.1 kHz, 48.0 kHz, 96.0kHz, and 192.0 kHz. The box for Encoded Formats just says: No compressed formats found. There doesn't appear to be a way to select a particular sample rate among the four that are listed. I've tried clicking and right clicking on 48.0 kHz with no effect, and the apply button remains greyed out regardless. Clicking on ok or cancel also makes no difference.
Really frustrating .....

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