Original post by: Tom No, the other one. ,
''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_loop_(electricity)) 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 expensive. If that’s the case you may want to see if you can find a surge suppressor that uses an older type of suppression device called MOV-1. My understanding is that these-developed when two-wire was the norm-will at least provide some protection as they will divert the problem before it gets to your equipment. I don’t have any specific suggestions other than that if you are thinking of buying a used one make sure it works. One other quick safety note: sometimes people will install a three wire receptacle or a GFCI receptacle so that they can at least plug the cable in without cutting off the grounding pin ('''''never''''' cut the pin off because once you’ve done that you’ve destroyed the computer’s ground wire circuit, which is designed with a specific situation in mind). If you do install a three wire receptacle keep in mind that ''installing a “grounded” receptacle does '''not''' introduce a separate ground''. The same is true when you attach a ground wire to the receptacle box/screw. (I believe-though I am not certain-that the electrical code requires such outlets to be labeled “No Equipment Ground”. You can find an illustration of this at http://www.electricallicenserenewal.com/Electrical-Continuing-Education-Courses/NEC-Content.php?sectionID=306.1.) Be Safe!