Since this is posted in the software/firmware category of the forums, perhaps you are thinking this is trouble with the firmware? It could also help to re-install the firmware on your Ultimaker.
You can do this via Cura. Connect the printer to your computer via a USB cable, then in Cura click machine->install default firmware...
This will get the latest firmware and install it on your printer. This could reset some things that might have gone awry in your printer's storage.
First check all the wires and plugs are plugged in correctly and not loose.
if it still does not work, give us more information on exactly what is not happening
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