Your problem is related to xorg.conf the screen section is wrong or missing using sax2 to recreate it should solve it just make sure to choose a display that fits closely to your one. Or use nvidia-xconfig i always found it did a better job than sax2 any way, but you’ll need to move your other one out of the way.
By the way try not to hijack threads, it can get confusing to the OP in some cases, and you get different replies for different problems.