I believe this may be helpful to you:
1. If you're running on battery power, check to see if your computer's battery needs to be recharged. Press the small button on the battery. You should see somewhere between one and four lights indicating the battery's level of charge. If you see just one light blinking, the battery needs to be recharged. Run the computer from the adapter in order to recharge the battery.
2. Unplug the power adapter from the electrical outlet and from the MacBook or MacBook Pro. Wait one minute. Plug it back into the wall first, then to the MacBook or MacBook Pro. Make sure the electrical outlet is working by plugging in another device (such as a lamp). When you plug the adapter back into the computer, the power adapter LEDs should light up green or amber.
3. Inspect the MagSafe port on the computer for debris, such as metal stuck to the magnet in the port, which might prevent the connector from seating properly. On the adapter side, look at the DC connector for dust or other debris and check whether pins are missing, bent or stuck down.
4. Make sure you are using the adapter that was designed for your computer. If you aren't sure or if you need a new adapter, learn which adapter is appropriate for your computer.
5. Disconnect any devices connected to the computer including printers, hubs, and third-party keyboards or mice, and test the computer again by trying to turn it on.
6. Press the control key, the command key, and the power button simultaneously and hold for three seconds to try to restart the computer.
7. Reset the PRAM.
8. Reset the SMC by removing the AC power, removing the battery and then holding down the power button for five seconds.
9. If you recently installed additional memory, make sure it is correctly installed and is compatible with your computer. Remove the new memory to see if the computer starts up properly without it.
10. If you are still unable to start up your computer after trying each of these steps, please schedule a service appointment with either an Apple Retail Store or an Apple Authorized Service Provider.
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