Speaker Pop On New Alu/Black iMac

Just got the new 24" 2.8 iMac and it's gorgeus, except for one thing. Remember the audio popping issue we all got with the 10.4.10 update? Well it seems to be back on this machine. Whenever I start it up or press a key that has audio (like volume up or down) or start playing any audio the sound system fires up and pops very loudly. I just talked to my friend with a new Alu/Black 20" and he hasn't had this problem at all, so now I'm thinking it might be an issue with the hardware. Running LineIn with silence solves it when I'm logged in but the pops still occur on boot, return from sleep, and when I first log in an LineIn starts.
This is pretty annoying. Has anyone else experienced this problem with their new iMac? Is there some magic I can do in software beyond what I've already done? Or do I just need to make the call and get another one?

I also have one of the new iMacs - one of the 20" models. I started having the same problem just a couple minutes ago. It worked without any problems for a solid week and a half, and now this? Puts a damper on the track I was working on in Logic. It just popped 3-4 times and then no sound eventhough my song was still playing and the volume meters on the mixer for each track were showing movement. Tried playing some songs in my iTunes library and still no sound - speaker output meter is at the halfway mark. My first thought was hardware issue, but who knows.

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