I have NO sound. in sound system prefs sunflower is on and will not let me go to internal speakers... what do I do?

I have a new big daddy MackBlloPro running 10.8.1 This actually happened after software update.. I have tried restarting... stil cannot get to built in speakers.......

Try a PRAM reset:
Power off the MBP. power it back up and before the sart up chime rings press the following keys: option, command, P,R,(no commas)  and hold them down till the sart up chimes again.

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