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Answer to "Apple STUMPED - iMac shuts off randomly, daily to multiple times/hour"I am NOT an electrician so YMMV. Observation not specific solution. Computer power supplies are delicate items and can be destroyed power problems other than a lightning-strike style surge. For example I notice a couple of people seem to be powering their equipment via ungrounded (2 wire in the USA) circuits. In those situations you may be experiencing a ground loop (explained at https://en.wikipedia.org/wiki/Ground_loo...)) or other problems that may be degrading the power supply circuitry. (I should say that even if you have a three-wire circuit it’s always safest to protect your equipment against all the different things that can go awry.) Protecting your equipment gets more difficult if you have a two wire system. I poked about a bit and found it’s quite difficult to find a power protection device that will function without a third (ground) wire. The best-and most expensive-solution is to have an electrician wire a new three wire circuit. But in many cases that’s either impracticable or hugely...