TX-NR708 No Sound

Purchased my TX-NR708 about 2 years ago. Was watching the Olympics on TV when suddenly the sound went out. I was able to get audio on the AM/FM Radio bands but that too went away. Tried a system reset and no success. I thought I would do a firmware re-install. However, the options on the menu are greyed out... therefore is not an option.
Does anyone have any suggestions?

Thanks.

In regards to your issue- it would possibly be more effective to contact our Product Support Dept for further assistance with this specific issue via our phone number and hours of operation below. We would like to speak with you and work to troubleshoot and resolve your issue, with you having access to your unit, as prompt as possible. Product Support is here from 9am to 8pm Mon. to Fri. and Sat. and Sun. from 10am to 4pm eastern std. time.

Thanks,


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