No audio MBP mid 2009

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hi all, having issues mbp after upgrade 10.9.5
speaker icon grey , cannot change, sound works when external speaker plugged in. else seems running little slow , laggy.

code:
devices:    built-in input:      default input device:	yes    input channels:	2    manufacturer:	apple inc.    current samplerate:	44100    transport:	built-in    built-in output:      default output device:	yes    default system output device:	yes    manufacturer:	apple inc.    output channels:	2    current samplerate:	44100    transport:	built-in
 



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