I have an interesting problem, it may be related, it may not be... Occasionally, my N800 will make a very high-frequency "hiss", even when it's not playing music. This hiss seems to have something to do with the processor working... The frequency is similar to the sound that an old-style CRT TV makes when operating. Most people can't even hear it, so probably that's why I've never seen it mentioned here... Hmm, I'm probably off topic. Whatever.