H2 won?t crank and dash goes crazy

[H2 Europe]

Hi.
My 2004 H2 won?t crank anymore. The battery seems ok. When I turn the ignition key the dash goes crazy (lights go on and off).
Sometimes it starts, but when the engine get?s warm it stops.
Last time when I locked the doors with the remote, the reverse light stayed on. Can anybody help me to solve this problem? The next dealer is 200 miles away, so I need to solve the problem on my own.
Thank you very much.