The Backlight Won't Stay on in My MacBook (6 Steps)

Locate the 'screen brightness' keys towards the top of the keyboard. These are also labeled as the 'F5' and 'F6' keys respectively. Press each one to see if the screen brightness increases or decreases. Repeat this step while holding down the 'fn' key until the desired brightness is reached. If this does not work, proceed to Step 2.
Click the 'Apple' logo on the top left of the screen and select 'Force Quit' to stop all applications. Select 'Sleep' from the same 'Apple' menu and allow the computer to sleep. Press any key to wake the computer. If the backlight is not back on fully, proceed to Step 3.
Click the 'Apple' logo and select 'Shut down.' Turn the computer back on after the computer has fully shut down. If the problem still persists, proceed to Step 4 to begin a System Management Controller Reset (SMC).
Shut down the computer and unplug the power supply connector. Remove the battery. On the polycarbonate body MacBooks, use a coin to turn the 'battery latch' to the open position and lift the battery out. On the aluminum unibody Macbook, remove the back panel screws (note the location of each screw for replacement) and lift the panel off. Lift the battery out of the case.
Press the 'power button' and hold it down for 5 seconds. You may hear a tone or beep. Release the power button.
Replace the battery and the back panel with screws if you removed those. Reconnect the power supply cable and turn the computer back on. Use the 'brightness' control keys (F5 and F6) to reach the desired brightness.
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