What keyboard shortcuts can I use when my 15" MacBook Pro won't reboot and i have a black screen

I have a refurbished 15" MacBook Pro. There have been several times when I turn off
my system that it won't turn on. I cannot remember the fix I used to start it the other times but I think it involved a keyboard sequence.
Anyone?
Many Thanks
belladonna1962

Resetting SMC?
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".

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