Imac 27inch (2011) sound problems

Hi all
I have the top spec 27inch imac quad-core 3.1 ghz 4 gb ram baseline model and I am starting to expireance sound problems. After a little while of having my imac on the internal speaks will just stop outputting sound. to fix this i have to put the imac to sleep and wake it up again or plug in and unplug headphones.
thanks

I would But i dont think it is a hard ware issue I think its a software issue i was just wondering if any one else has this problem

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