Have a friend has a Samsung HD box no DVR. 50 inch plasma HD tv. Worked last night, this morning no sound. Connected thru HDMI. Have him doing a hard reset now unplug for 30 min. I think his box may have failed. Is this common? Sorry I have Satellite not familiar with cables equipment issues. Can't stop by him he's too far, he called TW, the service rep from India was no help. Thanks