So a fellow I was selling an android tablet to today was telling me his wife dropped her iPad 2 flat on it's bottom and the screen went black. (Same scenario as everyone else's pretty much.) He was told by the Apple "geniuses" that they would charge him $300 to fix it, if it was fixable at all. (I seriously hate devaluing the word genius) So he said to me that he would leave it with me for a week to see if I could figure something out and if i could fix it he would give me a hundred dollars for my time!
So he leaves my place, I start searching and 25 or so later found this forum post. I then proceeded to chuckle out loud seeing as I've never fixed anything with a smack. That's usually how to wreck things not fix them! I thought what the heck, I'll give it a try and low and behold it worked! So I called the fellow back and at the 36 minute mark after he left my place to tell him his wife's beloved iPad was working again! Needless to say he was stunned!
My brother in law figures that when the iPad drops like this one did, the magnets that allow the iPad's screen to turn on when an approved case is opened were stuck so that the iPad registers the case as closed. Whether or not that is the case, I do not know, but it would explain the issue and the how the smack on the back rectifies the issue!