We're excited to announce that we've fully migrated the Xbox Forums to their new home, here on the Microsoft Community forums!
As of today, going to forums.xbox.com will redirect you here to the Xbox area of the Community forums. We've moved all of your existing threads over so you can continue and start conversations with the new forums experience.
We sincerely appreciate the feedback you have provided over this transition and can't wait for you to check out the new Xbox Forums!
Are you using a surge protector where your Xbox is plugged in? Sounds like you might have had a slight power surge which could have fried your sound card. Sometimes it's the whole system sometimes nothing at all. Make sure all your cables are securely in
place as you could have a loose audio cable (tv, stereo, external speakers, etc.)
If your running 1080p try lowering the res to 720p and see if that helps. Clear your system cache as well.