Apple's mention of a "ground loop" possibly being the problem in other posts was the best advice I found. Plugged it back in, booted back up and SOLVED. I shut down the iMac, unplugged the power cable from the wall, grabbed a pair of needle nose pliers and then ripped off the GROUND PLUG from the power cable. all weird, misguided and did not solve the problem. Read and tried a few things that were completely useless and weird to even give a try (but I did regardless) - things like : 'zap the PRAM'. : something like a system sound would play, there would be silence, and then after about 10 seconds or so the BUZZ would constantly output. I use the headphone jack output for audio playback from my iMac (Pro Tools, iTunes, etc) and after upgrading to the iMac from my Mac Pro (early 2008, quad core) physically configured the same way (headphone jack output to my speakers) the iMac would constantly emit a BUZZ shortly after any sound was outputted from it. Well, Apple probably won't like this advice but it EASILY worked for me :
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