A neutral/grounding fault will energize all your home devices with live potential same with a live/neutral swap (unlikely but possible with Indian wiring standards). Not only that, the upvotes from that alone were a good part of the reason I became an Amazon Top Reviewer. I'd like to think I can give myself SOME credit for causing them to do that. Seeing this, I bought the new model for my mother. It eventually got to the point where a year later in 2014, Shark released an updated model with no more metal strip. Soon, the tide turned, and more people started upvoting my review than downvoting it and I even received personal "thank you" messages from the people who got shocked ("finally someone believes me").
I started defending every single one-star reviewer person, and I wrote my own very detailed review with photos of the handle. To the electrical engineer in me, everything made sense!
I remember seeing this while looking at vacuums for my elderly mother who has a heart condition. IIRC, even Shark responded saying that it was impossible for the vacuum to shock you. Some of the people claimed they were getting shocked PRETTY HARD, too, as in it knocked them over. The reactions from the fanboy crowd were non-sympathetic ("you're imagining it," "it's just static," etc.), and they mass downvoted every one-star review. This vacuum had the most five-star reviews on Amazon, but then a minority of people started complaining and leaving one-star reviews, saying they were getting shocked. The vacuum's power cable did not have a ground. Believe me - try it! If it doesn't help then make sure that you have a replacement IEC power cable (the one that has a female 3-pronged end and a male 3-pronged end) to swap out to if not successful.Shark used to make an (otherwise excellent) upright consumer vacuum cleaner with a metal strip in the handle.
As a professional I cannot profess to know that the possible negative implications might be from having a non-grounded iMac but let me just say that this is not the first time that I have done this with a computer or any type of gear for that matter to just basically "move on".They did/would not offer this solution but for me, after working in recording studios for more than 25 years now and experiencing MANY types of grounding issues with regard to BUZZ in the audio signal - it led me to just rip that ground plug off and move forward. 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 :