There is not sound can't use f key to turn on of off by mute keyoff

I have no sound my my computer . I can't turn the on and off key and mute buy my key board , yes I am writting with it and offer keys work

An SMC reset usually fixes that.
Resetting the SMC (System Management Controller) on Intel-based Macs:
http://support.apple.com/kb/ht3964  and
http://support.apple.com/kb/HT1237?viewlocale=en_US
Resetting your Mac's PRAM and NVRAM:
http://support.apple.com/kb/ht1379

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