Zune won't unlock
My 120 GB Zune won't unlock. I can't do anything with it, it won't play.
It doesn't matter if I move the switch, it won't unlock. It was working fine earlier.
This could be a hardware issue but without physically examining your device it would be impossible to tell.
Does your device turn on at all? Are you sure the battery is fully charged?
Try rebooting your Zune. You can reboot a 120GB Zune by pressing the back button and the top of the Zune pad at the same time. Hold these buttons until it reboots.
If none of these fix your problem, I recommend sending your device to Rapid Repair for a free diagnosis. You can find out how to do so here.
Zune HD Information