I'd often wondered this, and would love to know the answer because my Dyson also has one.
Speaking of strange noises, there is something that's been bugging me for years now. Some of the world's most brilliant scientific minds, together with a handful of top celebrities and the Whitehouse autoresponder (yeah, I was bored) have collectively and dismally failed to satisfactorily solve this conundrum, and now, in a final act of desperation, I'm throwing it out to you lot. So here it is, the bane of my very existence (ex-wife notwithstanding): Where in the name of Burt Reynolds' mother does that f*cking beep come from? Yeah, that one. The one made by digital watches and calculators and cameras and every other piece of electronic tat in the world that goes beep but contains nothing that vibrates or remotely resembles a f*cking speaker. For the love of God, somebody must know what's doing it!
