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Hello Jack, my name is ***** ***** I'll assist you. I'm sorry you're having trouble with it.
Media box is capable to provide Dolby Digital sound output through optical out and it depends connected video source if it sends out such audio signal.
Regarding HDMI input issue, I would recommend to unplug TV and media box power cords for 10 minutes to get it reset, replug back in and check. If it doesn't fix the HDMI input issue then it would need to replace HDMI processor board in media box and this repair may cost around $200 plus, however you can buy replacement media receiver around that amount as well, need to check the ebay or amazon with media receiver model number to get price info. You may please use following link to get list of TV repair shops in area which will help to get repair quote...http://www.tvrepairpros.com/I trust my input will help you out. Please feel free to respond if you have any additional questions.A positive rating to answer would be greatly appreciated, please click on 5 star on this page then click submit/finish button so I can get credit on website for my work. If you don't see rating option then intimate here.Regards,Shahid.