Q: Why doesn't my iPod start after coupling it to iTunes 12? It is fully charged since last night

So I just downloaded version 12.1 of iTunes. When it was done I restarted my laptop, as requested for the download to finish. I then added the songs to iTunes and coupled my iPod Nano to my laptop. At first it reacted normal, then the screen went black and no synchronisation occured. My laptop gave the notification that "it didn't recognize the device", which is weird because this was not the first time I coupled my iPod to my laptop. When I detached my iPod it's screen remaind black and now I can't seem to turn it on again. What happend and how can I turn my iPod back on??