Since you say "i can't activate ground service via menu or ctrl+F12", it seems to indicate you DO have the GSX menu visible under the Addons menu of the sim.
If you have the GSX menu visible, the only possible reasons why GSX doesn't start are:
- Another addon has taken the GSX hotkey.
OR
- GSX is trying to tell you something why it can't be called, by you don't see if, because you might have turned down the "Verbosity" slider all the way down from the default, so every message from GSX is disabled.