Noisy audio + audio output turns off / on - annoying

The audio out on a MBP (10.5.4) turns off after about 30 seconds, then turns back on when it makes any sound such as an alert sound, playing a song in iTunes / Quicktime, etc...
Case and point: Listen with headphones (or with your ear close to the laptop speaker) and do something that requires audio - e.g. just duplicate a file using Apple+D, you'll hear your alert sound. Then listen for 30 seconds - you will hear a faint hiss (with good headphones), then a click/pop as the audio turns off. WHY?
And this is really annoying: there is also a click/pop sound when you start to play something if the audio has turned off, i.e. the audio output has to turn itself ON again. Plus, in iTunes there is digital distortion and some very faint high-frequency hums.
I have my old PowerBook G4 sitting next to this MBP and it does NOT do this. So it begs the question: Why does Apple have to change things like this? Why change the audio output to turn off after 30 seconds? How is it that iTunes on a MBP creates digital distortion?
There is NO digital distortion within iTunes on the Powerbook G4. (I compared the same exact track from iTunes on the MBP to iTunes on the Powerbook G4.) There is NO digital distortion when playing audio through Quicktime on either laptop.
I don't get it. Apple/Mac should be improving their products. They bought Logic 8 from Emagic! That must mean they are interested in audio, yes? Then WHY cheapen the audio outs?
This is essentially a post to see if there has been any fixes for this problem, or to see if Apple/Mac really care or noticed. I hope it is the former.......

I have a brand new Macbook Pro Unibody 15'', which presents the same issues, but with some peculiarities. I have M-Audio reference speakers, connected with an analog cable minijack to RCA cable (note: they work perfectly when connected to the ext. firewire audio interface..) .
The weird thing is related to whether I have the power cord plugged in or not:
- with the magsafe power cord plugged in I only hear the intermittent "high pitched noises" described here: http://tech.kateva.org/2007/06/macintouch-review-audio-noise-in-new.html. They are apparently random .
- when I unplug the power cord I can hear all kind of sounds and noises: I can hear the harddrive spinning and seeking, a "fixed" background hum noise, more noises even when I type or move the mouse or use the trackpad.
UPDATE: When the external audio interface is not plugged in (it's a M-Audio firewire solo) I hear no more noises from the internal audio output ! Must be all related to some grounding issues of the audio interface.

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