A few quick tips from Apple's web site:
Full Page
1. Press the control key, the command key, and the power button simultaneously and hold for three seconds to try to restart the computer.
2. Reset the PRAM. After pressing the power button, hold down these keys simultaneously: Command-Option-P-R, until you hear the startup chime at least one additional time after the initial startup chime.
3. Reset the SMC for the MacBook And MacBook Pro by removing the AC power, removing the battery and then holding down the power button for five seconds.
4. 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.
If none of these work try powering you macbook on with just the power cable plugged in and no battery in it. If this doesn't work it may be a power issue. This means the DC inverter cable may be bad or loose.
*Before making replacements on internal components its a great idea to bring it in to Apple's genius bar so they can help isolate the issue. This will help you find the problem.
iFixit DC In Cable.
If none of these steps work it may be the logic board.
Hope this helps!
-Varsity
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