Am I completely stupid? ...! When I wanted to remove the mainboard, it was still connected to a plug. I searched, but found no indication about this plug. So I had to try to figure out how this plug works. I started trying, which finally tore the console off the board: -o ...: .- ( It is a small plug to the right of the power supply - Pic. #3 top right!!. Comes below the battery. Note, this must be pushed backwards, but may have a lock. What can I do now? If someone has a tip that I do not have to change my motherboard, I am very, very grateful!