Scratchy sounds !?...

Hi ,
my set up is : AIFF files/iTunes library in W.Digital 1TB drives ->via powered Logitech USB hub to late 2008 alu iMac w/ 2,66Ghz C2D, 4GB RAM, 320HD ( 140 GB available..) -> via 1mt USB cable to Cambridge Audio DacMagic -> via 5mt Qued interconnect to Onkyo Integra stereo amp -> via Supra 4mm cables to B&W DM603 S2 speakers. all connections are O.K.
The W.D drives (3 of them..) Logitech hub, iMac & DacMagic are all connected to my APC Back - UPS ES 700 which still has ''room to spare'' power wise..
adding the C.Audio Dacmagic just made music sound fabulous
a couple of days ago while listening to some songs i already had listened to with the DacMagic, they suddenly had occasional bursts of ''scratchy'' treble ''distortion'' ( if that's what it was !?..) most unpleasant & which, if louder, i think could damage the speakers.
i went to the Audio MIDI Setup.app to check & all was well - so i decided to erase said tracks. went on doing whatever i was doing & later, just in case, took the tracks out of the trash, reimported them to iTunes & gave them a listen : all nice again, no ''scratchyness'' ...nothing !!?
at the time i had Safari, Apple Mail going & nothing else - oh, before i forget : i had downloaded & installed Derman Enterprise's iMac Fan Control & had upped by around 10% the fan's speeds - i've been feeling my iMac running a bit warmer than usual the last few days...
anyone has a clue what might be the reason for the ''glitch'' in the sound ? i did a bit of a search for other ''scratchy tracks'' but couldn't find any, all the rest sounds absolutely fine & now the ''scratchy'' ones sound fine too. are there apps/processes/other? known to interfere with the sound output ? even though it's outputting via USB not via the soundcard ?! the only other factor i can think of is the air con is on but i always have that in the warmest summer days anyway so... i'm at a loss here & any help would be greatly appreciated
best wishes to all
Nuno

Dear Tania,
as for the buzzing sound, that is pretty "normal" on at least the 17-inch-PowerBooks. I had three of them in a very short period of time (the first two were defective), and all exhibited this behavior. Also, you can find many accounts of that on the Internet. I have, however, never heard of this being a fatal flaw; just a major annoyance. (Try to set processor performance to "minimal" and it should go away for the most part.) It has to do with (in my opinion) poor quality control and even poorer hardware design (and I don´t mean the looks) on Apple´s side.
As for the harddisk, it again would be normal that there is disk access about every 30 seconds, even if you do next to nothing (the process "update" writes cached data to disk in 30-second-intervals). If your HD is active still more often it could have to do with Spotlight gone wild (greetings to Apple´s software engineers).
All in all, from what you tell us, I don´t think that your PowerBook will die anytime soon.
Jochen
PS. Before I get bashed here, I want to say that I´m content with most what Apple delivers. I have switched from Windows and wouldn´t go back. However, I experienced far more problems with my PowerBook and Mac OS X than with my laptop and Windows XP.

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