ipad pro not restarting after using logitech keyboard

Hi,

Got my logitech keyboard yesterday, started real good.

Closed the ipad yesterday evening, switching off the ipad pro with its on-off button.

Left it on the charger.

This morning no life in the ipad pro at all. took it out from the cover, tried switching it on, tried changing charging cables: no life at all.

anybody recognise this?

George