APU not starting ?!

I don't know what happened to my system - out of nothing I am experiencing strange effects.
It started with an error message about the complexjoy.dll, then I reinstalled JL on the Server PC. OK with this one now.
Now I wanted to make a flight, but the APU is not starting anymore. I follow the standard routine as always:
- batteries on
- external power on
- fuel injected, fuel pipes open
- APU Master switch on > APU screen appears on ECAM + Flaps Open message
- but then on pushing the APU Start switch nothing happens...

I restartet all computers and repeatet everything twice - same effect.

No idea, where this is coming from :-(
Any ideas?

Michael

solved unexplainable as it came...!

EDIT: hoped too soon! Seems to be a larger problem in combination with P3D and the way I have to start everything in order to get my 180 degree view running - will open a new thread