I tried the sugested fix several times and it still left me with a frozen brick and since i don't have an extended warranty i cracked the puppy open and it worked
pull the battery plug wait 10 sec. re-attach battery cable but before it reboots hold the left button and center and left arrow for a full reset as well as going into settings and under software where it says forget all devices unplug zune from computer then back in again. Go through complete setup as if it were the first day all over again and this does work the software will reload new firmware and software upgrades at the same time. then reload all media which in my case will take hours
i'm currently at a 68% sync
if your like me and don't have an extended warranty and don't want to wait and pay the extra money to send it back to microjerks use very small screw driver for glasses and take your time