The switch in the new iPad that allows a cover to put it into sleep mode is only activated by the negative (or south) polarity of a magnet. If the magnet in the smart cover you have has the positive (or north) polarity facing the screen it will not turn the screen off. (I have tested this on over smart 20 covers using a magnetic polarity tester). This is a new twist that Apple put in the new iPad. Either polarity will put the iPad 2 into sleep mode, so a case for that device has a 50-50 chance of working properly on the new iPad.