Mac OS 10.7.5 No sound through external speakers

I have had this iMac for about two years with the Bose Companion 20 external speakers hooked up. All of a sudden there is no sound through youtube. iTunes, speakers work fine. BTW
I also have a MacBook Pro that is about three months old and after a software update yesterday it also has no sound through the internal speakers on youtube only (that I have discovered).
But I am more concerned about the iMac, where these Bose speakers deliver excellent sound, and I am a classical music fan.
Any help? And please don't speak in code (I have no idea what "reset the SMC" means). Thank you!

Click on the YouTube speaker and turn up the Volume.

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****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
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Mac OS 10.7.5 No sound through external speakers

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