w166 main screen

Maybe this has been discussed before but I would like an opinion. Recently got an ML and looking on what options do I have to add a bit of functionality to the current infotainment system. My car is a 2015 model with command I believe and a reversing camera. The options I have gathered so far...

Have a 2012 w166. Bought from Mercees a few months ago. A couple of days ago the (main) screen didn't turn on when I started the car. I turned the car off and on again, still no screen. Got to my destination and was there half a day and when I got into the car to return home, the screen started...