Sound not coming from imac

I am facing a very strange problem with my Imac. When i am pressing the volume keys on keyboard it is showing muted sign on the screen. No sound is coming from the speakers. Sometimes the muted sign automatically goes and also suddenly display on the screen. But when i am connecting a external headphone sound is coming. So is this a speaker problem or keyboard or any other hardware problem. What is the solution ?

Your audio settings may have been changed.
Open Audio MIDI Setup (/Applications/Utilities/), then check the Audio Output setting.
Change the Audio Output setting to 44100.0 Hz.
Quit Audio MIDI Setup.
More info here on no sound from built-in speakers:
http://support.apple.com/kb/TS1574?viewlocale=en_US
Or an SMC reset can often cure the problem:
Resetting the SMC (System Management Controller) on Intel-based Macs:
http://support.apple.com/kb/ht3964
Resetting your Mac's PRAM and NVRAM:
http://support.apple.com/kb/ht1379

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product name: HP pavilion dv5 laptop
operating system: windows vista 32 bit home primium
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****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
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Microsoft MVP - Windows Experience

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