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  1. Member
    Join Date
    Dec 2006
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    United States
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    My computer stopped working over 2 weeks ago. The computer place a friend of mine took it said the motherboard was bad. My friend of mine rebuilding it with new and better parts. I been using a ups on my desktop for 4 years till it stopped working. Last it did was the graphics kept flicking then that was it. my question is do ups do any harm to a computer or anything connected to it? I connect my hard drive enclosure to it too but on the other side. I'm using a cyberpower ups. I use to have a apc i used on my old desktop till it the apc stopped working.
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  2. aBigMeanie aedipuss's Avatar
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    Oct 2005
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    666th portal
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    there are 2 different types of ups boxes. one is square wave and the other sine wave power. most newer motherboards need sine wave power like what comes over the line. other than that neither type will do any harm to devices connected to it.
    --
    "a lot of people are better dead" - prisoner KSC2-303
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  3. Member Cornucopia's Avatar
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    Oct 2001
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    Yes, but just because a UPS is supplying power in an uninterrupted fashion doesn't mean it has the proper regulated voltage it might need. Brownouts or steady over- or under-voltage can do much cumulative damage, to the point of premature failure. Even dirty power can engender shorter device life (in addition to increased self-noise).

    Scott
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  4. Not likely...
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  5. Member
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    Jul 2007
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    Can it? As pandy stated, not likely. Did its? Even more unlikely, but possible.

    On of the things people ignore, is that a UPS, surge protector or line protector is a one hit wonder. If there's even a possibility it was hit by a major power surge, either by lightening or from the electric company, usually indicated by your device tripping off, it's time for a replacement. It did its job of protecting the equipment plugged into it by sacrificing it's own internal components. This happens a lot with powerstrips with surge protection. It trips itself off and people assume it's the electric company's fault when it's actually the device saying: "I've done my job, let me rest in piece."
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  6. Member
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    Dec 2006
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    The ups its new only two years old its set at 120v its what it auto sets it does go to like 200v and a bit little past 200v but drops back to i think i was 180v i seen it do that. I had a apc that i used over 5 years on my computers. I say i take your guys advice and not worry ups fault at my pc motherboard dying on me. I do get very little power outrage. But we do get a lot of storms.
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  7. Not likely if you know how PSU and UPS works internally. Of course there is always small chance that UPS is malfunctioned however statistic shows that PSU's are "weak link" devices. PSU has rectifying bridge that turns any incoming current (can be AC or DC) to DC, later there is PFC circuit and later after PFC there is proper PSU part (DC/DC converter).
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    Even severely distorted power (so worst possible case where UPS produce square wave) will be converted to DC in Graetz bridge...
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