Hallo guys, I'm new on this forum and went through a lot of previous posts, but could not find anything related to my problem. I have flown the pmdg 737 ngx a few times and enjoyed it very much........suddenly when I loaded pmdg cold&dark setup and after I have connected ground power and done all the necessary steps to power the aircraft up, I was able to go into the fsx actions and the pmdg menus on the fmc. When I push the fmc button (LHK1) on the main menu of the fmc, to start with all my flight plan programming, nothing happened. I could not enter the fmc on the main menu. I also received a msg "Single fmc operation". Please guys....what am I doing wrong? Ive tried everything and could not enter the fmc on the main menu of the fmc. Hope somebody can help me.