2nd Gen iPod center button not working

I have tried just about everything to get the center button to work. It has stopped on me once before, but it was a long time ago and I can't remember what I did to fix it.

Every other button works just not the center button. I have tried restoring it, resetting it, and toggling the hold button. But to no avail it will not work.

If anyone can help it would be greatly appreciated.