My macbook pro will turn on but will not start up.

My macbook pro ['08 Silver keys] will turn on but will not start up. Screen is black and keyboard is unresponsive, besides power button. Help!

ugh, no chime is not good, as that means it is not getting past the firmware POST phase.  Is the sleep light blinking fast?
One thing to try is to access the RAM slots, remove, then replace and reseat the RAM.
http://support.apple.com/kb/TS1365?viewlocale=en_US

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