Some Xbox 360 users who updated to the New Xbox Experience have reported hearing only the sounds of silence through their HDMI cables (the phenomenon, not the song). The problem appears to be caused with older monitors and devices that are not compatible with a new HDCP driver found in NXE.

Speaking to Shacknews, Microsoft said, "We are aware that a handful of Xbox LIVE users are experiencing audio issues, and are diligently monitoring this issue and working towards a solution." No timeframe for the fix was given; in the meantime, you might want to dust off those antiquated component cables.