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Message: <blockquote data-quote="Randy B. Singer" data-source="post: 1718380" data-attributes="member: 190607">My experience is that when this sort of thing happens (and I've seen it a whole bunch of times), it has never had anything to do with software.  It always has had something to do with either the Mac's power supply, or the power coming from your wall outlet.  In a few cases it was due to either a bad (or improperly adjusted - back when it was possible to adjust them) power supply, or one that had cold solder joints that needed to be attended to (just touching each joint with the tip of a soldering pen to reflow the solder was enough to fix things up).But much more commonly it was due to something on the same electrical circuit that had too much of a draw, causing a sag in the power, and that sag caused the Mac (or Macs) in question to shut down.  (Fortunately with no other obvious damage.)Often the problem is that the user has a new laser printer.  They have a huge draw as they start a new print job.  In one case the problem was that an office had a refrigerator in the break room, and when it cycled on it caused all (or most) of the Macs to shut down.  (That problem perplexed the entire office, and it was fun tracking it down.)In each of the latter cases the solution was to attach each Macintosh (but *never* a printer or the like) to a UPS that included automatic voltage regulation (AVR).  (A cheap UPS that doesn't have AVR won't help!)  This is the brand and model of UPS that I most often recommend:CyberPower 1000AVR ($110 with free shipping)<a href="http://www.amazon.com/dp/B000QZ3UG0/?tag=macforums0e4-20" target="_blank">http://www.amazon.com/dp/B000QZ3UG0/?tag=macforums0e4-20</a>or<a href="http://is.gd/iaxI4" target="_blank">http://is.gd/iaxI4</a></blockquote>

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