We have a computer that shuts down every 2 days or so, symptomatic of a bad power supply. But we also have AC Input voltage, from the wall outlet, that fluctuates between 109 and 118 in a 4 minute period. The computer is connected to an APC 500 es UPS, and the voltmeter shows the same fluctuation in the battery side of the UPS, where the computer is plugged in. In other words, this UPS does not regulate the ac voltage. We haven't checked out the internal pc power supply yet, because we have a suspicion that the ac input voltage to the PC is the real culprit. Could this suspicion be true? Note: My apologies if this question has already been answered, could not find a clear-cut answer. DOES AC INPUT VOLTAGE IN RANGE 109-118 cause problems?
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