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could be a number of things including the power block faulty, a break in the power lead, the power regulator in the macbook or even it's just plain old dead. if the macbook lights come on when it's plugged in and nothing else happens when you press the power button, odds on it's just dead.
Make sure that your power cord and magsafe port are both clean. Reset the NVRAM (http://support.apple.com/kb/HT1379). If you have another cord, try that. Also try removing the battery and checking the connection between the battery and the connector. If all else fails, your battery is probably going bad.
- Turn machine off; remove power cord; remove battery.
- Without battery or power cord, press the power button and hold it down for at least 10 seconds. This discharges power 'residue' in the machine [and, I suspect gremlins].
- Reassemble power cord and battery.
First try this: shut it down, disconnect the power cord, pull out the battery, then hold the power button for a full 10 seconds. Reinstall the battery, reattach the power cord, turn it back on.
Still doing it? Put the reboot disk that your Mac came with, or the disk to the version of Mac OS X that you're running.
To start from disk hold "C" as your Mac is first turning on from a complete shutdown.
Dan Crowley, iKnowApple.com
Could be a disc error. Make sure your battery is in the correct way as it can go in 2 different ways. Line the slots on the battery to the prongs on the laptop. Before I go on, it may be you battery is dead for some reason?
Go to applications folder, find disc utility and hit "repair disc" it will come up with ANY problems your computer is having. You will then have the option to "fix errors"