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<blockquote data-quote="Randy B. Singer" data-source="post: 1763194" data-attributes="member: 190607">Usually when I've seen this it is either due to a failing power supply, cold solder joints around the power supply, or power fluctuations.&nbsp; If the latter is the problem (common this time of year due to everyone using their air conditioning), a good UPS that includes AVR is the solution.Here is a personal experience.&nbsp; A law office was having a problem with their Macs shutting off unexpectedly, usually all at the same time.&nbsp; After some sleuthing, I found that the problem was that they had a refrigerator on the floor in the break room that, when it cycled on, it caused such a sag in power in the office that their Macs just shut off.&nbsp; (Sometimes a large laser printer will cause the same thing to happen when you turn it on.) New CyberPower UPS's on each of the affected Macs solved the problem:CyberPower 1000AVR ($105 with free shipping)<a href="https://www.amazon.com/dp/B000QZ3UG0/?tag=macforums0e4-20" target="_blank">https://www.amazon.com/dp/B000QZ3UG0/?tag=macforums0e4-20</a>or<a href="http://is.gd/iaxI4" target="_blank">http://is.gd/iaxI4</a></blockquote>

[QUOTE="Randy B. Singer, post: 1763194, member: 190607"] Usually when I've seen this it is either due to a failing power supply, cold solder joints around the power supply, or power fluctuations. If the latter is the problem (common this time of year due to everyone using their air conditioning), a good UPS that includes AVR is the solution. Here is a personal experience. A law office was having a problem with their Macs shutting off unexpectedly, usually all at the same time. After some sleuthing, I found that the problem was that they had a refrigerator on the floor in the break room that, when it cycled on, it caused such a sag in power in the office that their Macs just shut off. (Sometimes a large laser printer will cause the same thing to happen when you turn it on.) New CyberPower UPS's on each of the affected Macs solved the problem: CyberPower 1000AVR ($105 with free shipping) [URL]https://www.amazon.com/dp/B000QZ3UG0/?tag=macforums0e4-20[/URL] or [url]http://is.gd/iaxI4[/url] [/QUOTE]

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