do you have another TV besides your plasma one? If you do you may want to try hooking that one up and see if you get the on screen menu.

Miscanthus, please tell me how you have your cable box hook up? The cable box is hooked up to your plasma or to the 990 pre amp?

Then how is the 990 pre amp hooked up to your plasma TV? what kind of cables are you using for the video picture? HDMI/DVI or component or S-video?
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Outlaw Audio 990 pre amp
Adire Audio sub (SVS 12.2 driver)
CAL Alpha tube DAC
Parasound P/HP-850 2 CH pre
Pioneer PL-530 TT
Polk Audio SDA 2B
NAD 2600A amp
Danger Boy here