Problem with Pioneer plasma after gaming console used for first time..

Components:
Pioneer Plasma #5010 TV
Onkyo TX-SR606 A/V receiver
Harmony One remote
Reactor 42 gaming console

The wife won a Wii knockoff mongrel video game console and we gave it to our son for Christmas. It's called the Reactor 42 and comes bundled with about 35-40 games.

Following the instructions, I connected it to our Onkyo TX-SR606 A/V receiver. It took a while to get it set up. I had to use the Onkyo and Pioneer remotes rather than the Harmony One. It finally worked, but with terrible resolution. They played a few games with it for a while. We then shut it off as the Green Bay/Philly NFL playoff game was about to start.

I then could NOT get the Pioneer to work!! When I pushed the power button on the Harmony (for TV use), all the components turned on, the Cox cable receiver, the Onkyo, and the TV. But, the Pioneer screen just showed the light blue color start-up screen. The input button (#4) showed '720P' as the setting in the upper right hand corner, but no picture...just that light-blue screen. Normally, when the system is turned on for TV through the Harmony, the info in the upper right hand corner that shows up before the TV picture actually comes in says '36 bit 1080P'.

I tried to change the input settings through the Pioneer remote and the Onkyo remote as well. No luck. I dis-connected the composite (Red/White/Yellow) and AC/DC power adaptor cables from the Reactor 42 from the Onkyo. Same problem.

Please help me out. Thank you.