read all this before you do anything! Press back and the up botton to reset it, when the zune logo comes up if it's a 80gig press back+center of pad+play. If its a 30gig (old zune) press back+left +middle. This deletes all you songs videos pic and the filmware. so you will have to transfer the all back to the zune when your done.Your zune should say please wait with a 3 on it. When your zune says this it means it's reinstalling the fillmware, i don't know how long you have to wait. Mines doing it for the whole day. I'm still waiting.
I've since resolved my issue by installing a new drive, trust me, mine was toast because it stared this immediately after being dropped onto a concrete floor