I have an 2011 imac. I erased the hard drive and started to reinstall the mountain lion, i entered my apple id because it asked for it, but it wouldnt start to install and then came text "mountain lion couldnt be installed, because it isnt bought with this apple id". So i thought that os x is tied to the apple id which it is purchased with, so i tried to install snow leopard to it. I put the snow leopard install dvd (retail version) in and pressed the "option" button when the computer started, so i got the boot options and chose the dvd. It wont start installing it just makes 3 "BEEB" sounds in a row and the screen is blank. I'm really mad that this relatively expensive computer is completely useless now. There has to be some way to make this computer work again. i cant even get to the internet with it to purchase new mountain lion and not even sure would that even work. What the hell is the point to even make operating systems to work with only one ID/computer that cant be reinstalled with out it and to prevent installing another operating system!?