Try borrowing charger from your friend and check if there is a charge light. If yes, your charger has a problem.
Else try performing an SMC reset and see if that helps, below link will help you do that:
https://www.ifixit.com/Answers/View/361096/battery+won't+charge+up%2C+no+green+lights
Or else In the below thread heating up the charger using a hair dryer a little worked for many. Just refer the below thread once:
https://discussions.apple.com/thread/4612451?start=15
Edit:- SMC RESET
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 for 10 secs.
4. Release all the keys and the power button at the same time.
5. Press the power button to turn on the computer.
Good Luck.
Peace.