Openelec: Nothing works anymore

Hey,

I managed to install Kodibuntu on a Raspberry Pi 2 and got it to work as PVR and player for videos on my NAS. Since a few days, nothing works any more. I am sorry for this description, but that is, what it looks like. When I plug the Raspberry in, it starts to boot, shows the Openelec-Icon, and then it stops doing nothing any more. Any idea, what I can do?

Thanx,

Joker