screen

Hi,
I have received my Wearable development kit and have been using it for a few weeks now.
All of a sudden the screen on the development kit stopped working, I can connect to the device and I can also see prints I am generating in code in the serial interface but the screen does not show anything and the touch functionality does nothing as well.
Is there a known issue for this to happen? Is there a way to perhaps hard-reset the device? Flicking the on switch on/off does not help (although I can see in the serial interface that something happens when I do that).