I would try a SMC reset first, if that doesn't work for you, a PRAM reset might as well.
To perform a SMC reset, remove the battery from the unit, and remove th e mag safe adapter. now when there is no power going to the unit, press and hold the power button for 10 seconds. replace battery, and power and try to start the unit.
To perform a PRAM reset, turn the unit on, as soon as it turns on (before the apple logo pops up) press and hold "CMD" + "Opt"+ "P" + "R". Continue to hold until you hear the unit "chime" 3 to 4 times. then let go and see if it boots up.
Now if these help, then great, your in business, but if you leave it for a while on, and all you see is a folder with a "?", then you most likely have a dead Hard Drive.
I would try to preform a SMC reset:
Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.
On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.
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Did you recently change hard drives or ram?
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