My iBook has this nasty habit or intermittently making an audible ticking noise. It sounds like it come from the speakers, but it still happens when 'Mute' is on. It doesn't always do it, but its INCREDIBLY iirtating. I phoned Apple and they asked me to take it to my nearest dealer before they arrange to collect it, to check it isn't a hard drive issue. The dealer has taken it in and kept saying how from what I described it sounded like just a normal noise. I have have had several Macs. My family now has two iMacs and a Powerbook. No mac I have ever had has made this noise. If it is coming from the hard drive there must be a fault with it. How can I get them to do soemthing about it? Bearing in mind that as its intermittent I can't just switch the machine on and say 'There you go!'?