I have a mac book pro.  It is 3 years old.  when I push the button to turn on the computer, it does not start.  The little light comes on, but the computer does not start up

I have a macbook pro.  It is three years old.  It has been working perfectly fine.  However, as of yesterday, whenever I push the "on" button, the computer does not turn on.  The little light comes on indicating that the computer has started, but there is nothing on the computer screen, and it does not make the usually noise that it makes when it cycles on. 
Any suggestions?

Check the battery status to make sure it has a full charge (and that the charger is working). Then make sure the screen backlight is turned up.
If the backlight is up then, try forcing the machine to shutdown (hold the power button for 5 - 10 seconds).  Then restart the computer(listen for the start up chime).
If the computer does start up and you still cannot see anything reset the PRAM by forcing the machine to shut down (hold power button as before), then press the power button and start holding the key combo
<Command>+<Option>+p+r
until you hear the start up chime two or three times, then release the keys and allow to boot

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