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Is your building's electiricty grounded? If not, it should be...
If it's an electricity/wiring issue with the building, it could explain it. Not all machine will get affected, we have the same situation and found out its because the building wasn't grounded (so we're getting that done tomorrow).
However if you have a backup power source / UPS installed and it doesn't help, probably a BIOS virus or bad motherboard. More likely the virus since it would be pretty coincidental all 3 computers' motherboards are fucked.
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