MacBook Pro begins to turn on but can't?!

It's an older MacBook Pro, running either 10.5 or 10.6 (I'm not really sure) :(
Anyway, when I hit the power button it does the cd drive humming for a second then stops and the whole laptop is off. No matter how long I hold the power button down for, it always does the same thing. Sometimes, it only does half of the disc slot humming, then on the next try it does the second half. I've tried restarting in safe mode (power+shift, yes) but nothing changes. The screen never turns on or does anything. How do I fix this??

1. Reset PRAM. http://support.apple.com/kb/PH4405
2. Reset SMC.     http://support.apple.com/kb/HT3964
    Choose the method for:
    "Resetting SMC on portables with a battery you should not remove on your own".
If this does not help, contact Apple.
Best.

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http://support.apple.com/kb/ht3226
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MacBook Pro begins to turn on but can't?!

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