I had a hiccup with the Zune yesterday.  I was trying to find a way to organize my photos better, rather than burying them deep in the Zune photo menus.  I discovered some registry hacks for WinXP to get the Zune to appear under My Computer…which worked, but my rearranged folders reverted to their original status once I synced the player again.  Then, while trying to reorganize things with the Zune software, I ended up in a state where I could not get the new images to appear on the player.  I did a couple of resets and managed to get them to appear…but again, deep in the photo menus.  Still trying to find another way to organize these–I did it once, but heck if I remember how I did it.

Anyway, to reset a Zune, make sure the hold switch is not activated.  Then, hold down both the “back” button and the top of the directional pad.  Keep holding them until you see the Zune logo and the white progress bar.

If you’re in the mood to reload your whole player, there’s a method to clear all contents.  Details here:  http://support.microsoft.com/kb/926917 .