I had an interesting experience on an EWR-SFO last week. Channel 9 was, I believe, on. There was no music playing on the channel, only silence. When the captain boarded, I overheard him telling the purser that he would turn on channel 9, and I confirmed mid-flight that channel 9 should be on. However, I could only get silence from the IFE on that channel (other things worked fine). Had a chat with the purser when we arrived and he speculated it might have been due to a power surge which delayed us on departure.

Anyone had a similar experience? I'm not going crazy about the music, and it wasn't just off, right?