you can do first is SMC reset by pressing and holding 4 buttons on the keyboard to reset all the system hardware . press and hold ( Left Shift+option+command+ power button ) for approx 5 seconds then put the charger inside then check its charging or not . if still not light in the charger remove the charger . hold the power button and put the charger in after pressing and holding power button after 10 sec release the power up button and press it again . your system will boot up may be . if boot up donot remove the charger . use it for a while and check its charging or not . if not then restart it from the mac osx . if still not power up then your have to open it up for checking whats wrong inside .