Hey folks, I'm thinking about buying a used ipad. My question is, when I'm buying it, what should I check for? With iphones, for instance, I know that you've gotta make sure the wifi works. And of course gotta check that all the buttons work, that it turns on and off, that a computer recognizes it, that the headphone thingie works. Anything else? What are some of the most typical problems? Help is much appreciated. Oh and I am NOT seeking advice on whether I should buy it.