Very high pitch sound on new Quad

Just got my Quad yesterday
Everything is good, except that it has a very high pitch sound that is very annoying and it hurts my ears in the long run.
I disconnected the HD and superdrive to see if I could locate the source, but it is still there.
I thought about pulling the gpu (6600 256MB), but I don't know if the Quad will start up without a gpu.
I thought the 6600 was supposed to be with a fan, but all I see is black cooling ribs.
Any others with this sound ?
Its not a fan noise, and not a pump noise. It is like a 'electronic' whine.

I have sensitive hearing and noticed something similar when I got my 2.5GHz liquid-cooled G5. It was a constant sound and believe it was coming from the cooling pump. Does your sound ever vary? Try running System Load and see if you can get it to vary.
-Bmer
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