Black Ops - "Not supported mode"

Hi guys,

i´m german, so please excuse my english which could be "bad" ^^

So my problem is that everytime I start Black Ops (ps3) at a 2D monitor, on the monitor appeares "Not supported mode".

If i start the game at a 3D monitor, I saw the disc is set at the 3D Mode. After switching the Mode to 2D and restarting the game the mode is again set to 3D.
The problem is the 3D monitor is own to a friend of mine. I do only have a 2D monitors, so it´s impossible to play the game.
The game was not installed, so reinstallisation is not possible.

Does anyone have an idea, which could help me setting the mode of the disc currently to 2D?

Thanks for your support

Regards Paddy