Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Yes, I just did that and nothing. I don't even get the "SLIDE TO UNLOCK" click nor do I get the click to put it to sleep or when the smart cover is closed.
 
Same thing happened to me.... Double press the home button, slide left to the iPod controls and make sure you arent 'soft muted'....
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.