Didn't know where to post this, but since this concerns an iMac specifically I thought I'd post it here. My Dyson vacuum causes the lights to flicker for a fraction of a second due to the 1200 watts it pulls from the wall, and this concerned me so I Googled, and I found that if one were to plug in such an appliance into the same power strip as a computer it could damage or fry the computer. Duh? I'm using a completely different socket in a different room of my apartment. But the lights still flicker/momentarily dim no matter what socket I try. Still, I called some local electricians and they told me "Such power sags and spikes caused by a vacuum could theoretically damage a computer" but I then brought up that "my fridge too dims the lights etc. worse than the vacuum, and I'm not going to shutdown my iMac whenever my fridge randomly starts its pump etc." So, is there really anything to worry about? Will the vacuum cause any damage at all? Do I really need to shutdown the iMac before I vacuum? This is a brand new 21.5 4K iMac, thus why I'm (overly?) concerned about it.