i recently had a hum problem and reived many helpful replies, please check this thread titled : i hate to ask but I Really Need Help
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Here is the thread Mkaes is referring to http://forum.audiogon.com/cgi-bin/fr.pl?htech&1079751123
Scroll down and click on Sean's response. This will be your guiding light. Just go slow, one step at a time. Proceed exactly in the order he has outlined.
Make sure you have feed pets and small children, you may be awhile.
If noise is that loud I dought it would be a ground loop or on line noise. Wiggle interconnects around you may have a broken return or ground wire in interconnect or a bad chassis RCA lead broken. Can you switch out interconnects and CD player just to check.