Error code 5 and 3 - Microsoft Zune JS8-00001 Digital Media Player

Hold the back button and the up button until you see the Zune logo then release. if this doesnt work then you are going to have to reset your Zune....however this will loose all the data on the zune so your music/movies will be completely gone. you are going to need to press and hold the back and up button until the zune logo appears then hold the back,play/pause, and the center button until you see "please wait"
if this doesnt work you have some serious issue. Contact customer support