HT1533 my sound has stopped working i have speakers plugged in but computer doesnt register or recognize them. the volume is on mute and grayed out ...will not let me change,what can i do to fix this problem....i have tried unplugging and plugging back in

my sound has stopped working i have speakers plugged in but computer doesnt register or recognize them. the volume is on mute and grayed out ...will not let me change,what can i do to fix this problem....i have tried unplugging and plugging back in and reset and headphones...nothing works..how do i get my sound back?

OS X Mountain Lion: If you can’t hear sound from your speakers
Read the "If you’re trying to listen through external speakers" section.

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    Header 1
    Header 2
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