My MacBook Won't Power On

Turn your computer off and disconnect any devices connecting to your computer, including a printer and your mouse. Keep the computer off for several minutes, then try turning it on again.
Check the battery level to your computer. On the side of your MacBook will be a tiny, circle button. Press the button in to test the battery. If all, or a couple, of the tiny lights glow green it does have battery life. However, if one light is blinking it needs to be charged.
Check out your MagSafe port and the battery adapter. Because the MacBook's battery port is magnetic, something could have gotten stuck inside of the port. Make sure the inside of the port is cleaned and cleared of debris. Take a look at the adapter, as well. Make sure the prongs, or pins, are not missing or broken. A broken adapter or dirty port will not be able to charge your MacBook properly.
Restart the computer by pressing Control, Command and the Power Button all at the same time. Hold all three buttons down for three seconds.
Schedule your MacBook for a service appointment with an Apple retailer or electronic/computer specialist if none of the above troubleshooting techniques do not work.
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