FP2 does not start

Hello everybody
Until yesterday, my FP2 worked well. Last night I turned it off normally.
But this morning I can not start it anymore. When I press the start button, the device vibrates at intervals of about 2 seconds. But nothing else happens.
I took it apart and cleaned the connections - without success.
Even if I connect the charger, the device starts vibrating at intervals of about 2 seconds.
Does anyone know this problem - and a solution for it?
Many Thanks

A post was merged into an existing topic: FP2 Won’t turn on or charge - See first post for troubleshooting