Only a set of component (red, green, blue video and L & R audio cables from a Wii) whicg I believe Jim had said would not affect any noise.

I will be sure to unplug those as well in the morning and try it again.

I also currently have the TV power cord (3 prong) connected to the outlet directly, bypassing the monster Power 1200.

Unplug everything from your TV. Even if it is only video it still has a ground somewhere. Disconnect the Wii and the power cord from the TV and see if the noise is gone. If it is then plug in the TV to the wall and check again, then do the same with the wii.

Will do, but I think I did this in my earlier troubleshooting escapades....

More info;

Outlaw 7700 amp, 3 prong plug
Marantz 7005 preamp, 2 prong plug
Panasonic Plasma HDTV, 3 prong plug

I wired a 14 guage wire from the preamp (ground scew) to the amp (screw on top front) to insure a ground. I tried running that wire right to a water pipe, and even though the DirecTv line is grounded right after it enters the house and prior to it feeding a 4x8 mulitiswitch, I grounded it again onto a water pipe above the stereo cabinet.

None of this helped.

I just double checked the connections at the plasma;

Nothing plugged into the plasma and plugged into the wall = no buzz
Only the 1 HDMI cable plugged into the plasma w/o it plugged into the wall = no buzz
Plug the plasma into the wall w/o turning the plasma on = buzz

This was done with everything else plugged into the Marantz 7005 (4 HDMI in, 1 out, plus 2 optical cables, and 8 RCA cables from my Oppo into the 7.1 input).

Suggestions?

..Sounds like it is coming from Plasma....can you switch in another TV/Monitor, then try?? or Maybe, isolate outlet for Plasma plug???Or even try running an extension cord from other section of house to Plasma plug....

cp1966, this is truly some great detectve work on your part. Ground loops are the worst.

For a test you can try one of THESE. For the test do not connect the ground lug.

If the noise goes away then the safety ground is the cause of the problem. It's strange that you are having this problem even though you are using a power conditioner. Maybe the Saftey Ground (third wire) in you outlet box is floating/not connected or else something is funky in wiring of the TV?

If this doesn't solve the problem then I'd question if the outlet is wired correctly or somehow sustained damage.

It is likely that even when the TV is off it is still trying to keep some components warm to aid in quicker startup. Maybe the TV is causing the interference directly. Try to run the TV as suggested above with the ground pin bypassed.

I have tested the outlets and they are ok, and grounded correctly. I haved checked all the wire connections in my electrical panel, all tight. All speaker and XLR cables are nice n tight

I have hooked up the hdmi cable to another TV (32" LCD) in another room, and there is still a little noise but not as much as with the 65" plasma.

Should I try the cheater plug on both the plasma and the outlaw 7700 Amp?

I would try it on the TV just as an experiment. If you try it on the 5500 don't use it at too high of power. Also the ground pins on the XLR connectors may not function fully for noise reduction but should be OK.