buttons work, but can't open any books without the touchscreen working.
If the touchscreen isn't working the prs 650 is bricked and I'd better buy a new one.
If its not It's salvagable.
So I will order a broken one to test unless I can know for sure that the touchscreen isn't working.
In that case the prs 650 is dead. I realy hate to throw away electronics!
Thx for your kind replies!