Hello there JLpoo,
I have a couple of resources that may be able to help in this situation.
First I recommend resetting your computers System Management Controler, or SMC using this article: http://support.apple.com/kb/ht3964.
This section specifically-
Note: Portable computers that have a battery you should not remove on your own include MacBook Pro (Early 2009) and later, all models of MacBook Air, and MacBook (Late 2009).
- Shut down the computer.
- Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
- On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
- Release all the keys and the power button at the same time.
- 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.
Also the computer has a built in Hardware test you can use. The article for that is named OS X Mountain Lion: Use Apple Hardware Test found here: http://support.apple.com/kb/PH11342, to help determine if you have a hardware issue.