Postagem original de: Micheal ,
if it still doesent work after cleaning you can try a smc reset, it deals with charging and all kinds of other hardware, ive had it fix a failed USB port before. 1 Shut down the computer. 2 Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected. 3 On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time. 4 Release all the keys and the power button at the same time. 5 Press the power button to turn on the computer. Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.