Sound quit working. The television worked just fine in the morning, then that afternoon when we

Question

The television worked just fine in the morning, then that afternoon when we turned it on, there was no sound ... (we hadn't done anything in between).We have gone through all of the menu screens and even tried headphones in the front jack but still have no sound.The picture is great and everything else (including CC) seems to be working just fine.Any suggestions as to what the problem could be?