Apogee One: Very Noisy

Hello, 
There is a large amount of static/hum/hiss that I have isolated to the Apogee One.  It is not in the signal path after the mixer, as I can plug instruments into the mixer and the problem is not present.  The culprit is either the audio cable from the Apogee One to the mixer, the Apogee One itself, the USB cable from the iMac to the Apogee One, or the iMac.  Here is a video so you can hear for yourself:
http://s125.photobucket.com/albums/p77/pianoman1976/Me/?action=view&current=P100 0415.mp4
Is the Apogee One known to be noisy like this?
Is the iMac the culprit?
I presume the first thing I should do is buy another audio cable and check it, yet this cable I'm using is new. 
Thank you. 

Ok, I tried something different.  I read the manual for the ONE.  Under troubleshooting it says: 
Symptom - When connecting speakers to ONE, there is hum and/or
buzz at the output.
Solution - In most cases, a steady hum or buzz at the output is
caused by grounding issues between ONE and the connected
equipment. Because bus-powered USB interfaces are grounded
through the USB and audio connections, and not through a
3-prong grounded AC connection, the situation may arise where
the grounding configuration of the connected equipment must be
modified. This may be done by connecting a ground lift adaptor to
the equipment’s AC connector to disconnect (or “lift”) the AC ground
prong.
Some experimmentation may be required to find the grounding
configuration that results in the lowest noise. It may be useful
to disconnect all equipment except ONE, the Mac and a pair of
headphones, and then connect additional equipment one piece at a
time.
So it looks like the solution is buying a ground lift adapter.

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