Stefan, did you fix your problem? I have the same issue... this works for me.
Connect power source.
Hold command, option, shift, r, p, and power for 10 seconds. Release all at the same time.
Immediately after release, power source light turns green; press and release power.
Fans come on, and stay on. Machine starts 20-50 minutes later.
I will travel to the U.S. soon and will have it serviced there. I hope this helps.