MediaBistro’s Todd Ogasawara picked up an iPad this past weekend and found something rather interesting when attempting to charge it via USB. Due to Todd’s computer being slightly older, the iPad refuses to charge off of its USB ports. This is rather different than what we have been used to with other Apple devices such as the iPhone or iPod.
The message you receive when attempting to charge the iPad with an incompatible computer is “Not Charging” which sounds simple and blunt enough. The solution is to only use the wall charger which will work every time, as Todd found.
UPDATE: According to commenter “mbacas,” the iPad will charge when the screen is off and the iPad is in standby mode. Thanks mbacas for that awesome tip!