Noise coming through Firewire audio interface (M-Audio Firewire 410)

I have an Intel 20 inch Core Duo iMac with an M-Audio Firewire 410 audio interface attached to the 800 Firewire port. The Firewire 410 seems to be working fine. However, I have a very annoying problem with noise. A fairly loud hum is coming through.
I'm pretty sure the noise is originating in the iMac. If I press on the LCD monitor or squeeze the case around the middle of the iMac, the hum diminishes. Sometimes when I do this, the hum diminishes but a buzz then becomes audible.
The iMac and the Firewire 410 are plugged into the same outlet.
I have a friend with the same setup who claims his is dead quiet. Does anyone here know what could be causing this and how I can fix it?
Intel iMac   Mac OS X (10.4.6)  

Any more news on this? I have the exact same problem, and the problem exists with a couple of firewire devices. I'm currently using a Behringer F202 (or something similar), but I had the same problem with a Firewire 410. I'm running Leopard, but I know the problem isn't related to the OS.
See - I have my FW interface hooked up to an external mixer - when I plug it into my iMac, I get the noise..this happens EVEN IF MY iMAC IS SHUTDOWN. I've tried using the external power supply for my Audio Interface, as well as running off of bus power to no avail. It is definitely a problem with the iMac itself.
I've ordered a FW Hub, and I'm going to try using the audio device through that next. I don't want to do this, but I also have a USB Audio device that I use for other things, and I found that it behaved much better when connected to a hub vs the the USB port on the back of the iMac directly. It seems obvious to me that the iMac has some weird power-shielding problem or something of that nature, so pulling it off to the hub which has its own power supply will hopefully help.
I do have AppleCare protection, so, my next step is to call them out.

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