I checked each one. What I think is weird is why would it go away when I unplug it, then reappear 2 seconds later?

This was a "quick" check as I did not have a lot of time. Tommorow I will unplug everything completely. Today I only had time to unplug, listen, and plug that cable back in (my cables arent labeled).

The only inputs I am running into my receiver are a CD Jukebox (analogue audio), DVD Jukebox (HDMI directly to the TV and coaxial audio to the receiver), the DirecTV Tivo (Component video and optical audio), PS2 cables (analog audio and component video), and a B & O turntable (analouge audio and a ground wire to the receiver).

Believe me, I am going nuts!
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Panasonic TC-P65S1 65" Plasma HDTV, Marantz AV 8801 Preamp, Outlaw 7700 Amp, Klipsch RF7 (X-over dean G modded) RC7 (X-over Dean G modded) RS7 CDT-5800C speakers, Outlaw LFM1 EX Subwoofer, Oppo BDP-93, B & O Turntable, Toshiba HD-A2, Sony CD & DVD 400 disc jukeboxes, DirecTV HD-DVR, PS2, PS3, Wii, Harmony one remote, Monster PowerBar 1200 for the TV, sub, PS3, HD DVD and Wii, Tripp Lite Isolation Bar for the Amp, Pre-Amp and other sources.