THX for the reply, but this seems not to be the problem. After putting on the hydraulic, still the same problem. Seems like a software problem if you ask me. When I hit the "L" button everything lights up but before everything has loaded correctly every light shuts down again. I think the problem is solvable if someone could say how and which lines I should add to my aircraft.cfg in the "LIGHTS" section. I´m using Windows 8 by the way, anyone else with Windows 8 and this problem?! Would be so great if anyone could help me/us out of this!!!  :-/

regards, phil