NO AUDIO IN LEFT CHANNEL:What is the quickest/easiest way to troubleshoot?

Can someone tell me how to troubleshoot the left audio channel? No sound in speakers nor headphones no matter what the source. Could this have been caused by the case being recently opened for the hard drive replacement (by an Apple authorized shop)? Is this a common problem in older iMacs? I'm capable of some techie work (I have done PRAM battery replacement, etc). Tried restarting and no change. Any ideas, let 'em rip this way! Thanks GREG P>

YUP!! Just before I logged back in to withdraw this post!! It was nailed to the right, just like an old sound engineer I once knew. Brains workin' slow; another 'senior moment' I guess. Wonder why that happened but that's life in the digital world. THANKS, JEFF and HAPPY NEW YEAR!!

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