Why isnt my sound working on my mac book pro?

All it says is Mac OS X Version 10.6.8. 2.66 GHz Intel Core i7. Start up disk: Macintosh HD. I've been on system pref and the output at the bottom i cant even move it only select if i want it on the menu bar.. its annoying me so much. and i beleive i have Leopard.

If you see red light in the headphone port, plug the headphone
in and out of the port 5 or 6 to flip the microswitch inside.
Sound output may be stuck in the digital mode.
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".
Best.

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