Wheni was listening to my zune musics it just froze and now it wont turn on?

First step is to let it drain completely and then plug it in once fully dead to see if it resets itself and clears the problem. If that doesn't work the next step
Soft Reset: Plug it in to the computer. If the computer recognizes it you can likely reset it. to do that push and holding the back and up buttons together.
Hard Reset: this will erase the information on your zune and restore it to factory settings with no information on it. Your information will be re-synced when you plug it back in to your comptuer.
http://www.zune.net/en-US/support/zunepl...

First step is to let it drain completely and then plug it in once fully dead to see if it resets itself and clears the problem. If that doesn't work the next step
Soft Reset: Plug it in to the computer. If the computer recognizes it you can likely reset it. to do that push and holding the back and up buttons together.
Hard Reset: this will erase the information on your zune and restore it to factory settings with no information on it. Your information will be re-synced when you plug it back in to your comptuer.
http://www.zune.net/en-US/support/zuneplayers/solvingproblems/reinstallplayer.htm