What in your setup with the 1121 is different than you had with the 1120?
If the Oppo cable between the 1121 and the TV is not what you used before, remove it and use what you did before.
You definitely want all of your HDMI Cables as "High Speed!"
Also the 1121 in the video setup, has a setting for either LCD or Plasma HDTV's and compatible HDTV Resolution.....720P / 1080P etc....
I can't get the on-screen setup stuff to work most of the time. Sometimes I can get it to work. The rest of the time the TV claims there is no signal.
Are you talking about the "Home Menu" with System Setup & MCACC?
If the TV shows "No Signal" have you tried shutting off the 1121 and then turning it back on so that there will be a HDMI Handshake between the two.
My Vizio will sometimes show No Signal with my 1020 and I either turn my receiver on and off or switch an input and then go back to the HDMI Input that my HDTV is on.
It is a Handshake issue.
With my Vizio to Pioneer VSX 1020, I have the Vizio HDTV turn on first and then the 1020 goes on, so that the Vizio senses the 1020 handshake.
Once that handshake is complete my HDTV and Pioneer is Locked in as far as TV and Home Menu, etc...
Let me know,