Why does my PC get restarted when I have a power outage even with a UPS?

Osama Javaid February 11, 2013
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I purchased my PC in January 2012 and I have connected it to an uninterruptible power supply (UPS) because I have frequent power outages here. It used to keep running smoothly on UPS whenever the grid was loadshedding (power outage for an hour happening few times a day) and I would at least have time to shut it down properly or keep it running with my monitor off if some download is running.

However now I have noticed it is getting restarted whenever power outage occurs and I lose my work whenever this occurs. This has only been happening for 2 days… can anyone tell me a reason and a solution?

  1. Prashant Mirjankar
    March 14, 2013 at 12:38 pm

    If you are working with Windows Xp better check the services if UPS service is running and is in automatic run mode. Windows Vista, 7 and 8 does have that service. To check the service
    right click my computer------> manage ------> services and applications -----> services
    Browse for Uninterrupted Power Supply service
    Double click UPS service click on start and then put select automatic in runmode..

    Hope you find this helpful

  2. Vijay Pereira
    February 27, 2013 at 4:40 pm

    If without UPS it is working normally then the problem is with the UPS
    or check your microprocessor and the fan..
    use a thearmal coat..
    pc restarts mostly due to overheating of processor.. try it.!! :)

  3. Vijay Pereira
    February 27, 2013 at 4:40 pm

    If without UPS it is working normally then the problem is with the UPS
    or check your microprocessor and the fan..
    use a thearmal coat..
    pc restarts mostly due to overheating of processor.. try it.!! :)

  4. Imesh Chandrasiri
    February 22, 2013 at 10:41 am

    The load which you PC requires is not supplied by the UPS. The common reason for this issue is the battery must be dying. You have mentioned that you use the UPS for over a year now. please check for the out put load of the UPS and the load required from your PC. if the UPS is unable to supply the necessary load it will switch off immediately.

  5. Nevzat Akkaya
    February 15, 2013 at 1:52 pm

    your UPS's battery cells might be empty, at their End Of Life state. This has happened to ours lately. Time for service.

  6. Âdil Farôôq
    February 14, 2013 at 8:14 am

    May be your batteries life is finished try to change your batteries. or the problem might be in your power supply.

  7. salim benhouhou
    February 13, 2013 at 1:22 pm

    is your UPS charged ? because sometimes when it's not charged well it can't supply your PC with power

  8. Vipul Jain
    February 12, 2013 at 6:07 pm

    Well this has happened to me and IMO, the problem is definitely the UPS.
    It's battery needs to be changed. Or before that try checking the fuse on the UPS, due to several outages, it might have been burnt out.
    It should be a red screw on the back that can be easily opened.

  9. Bruce Epper
    February 12, 2013 at 4:45 pm

    Since you left out 2 pieces of information, I will lay out all of the options.

    First, assuming that it is a standby system and the computer is dropped immediately, your UPS battery is dead (in which case there should have been an alarm from the UPS), the cutover circuitry is not performing properly (switching delay is too long), or the voltage detection circuitry is malfunctioning.

    Second, assuming that it is a standby system and the computer remains active for a time first, it would indicate an aging battery which is no longer capable of providing the power required for an extended period of time.

    Third, assuming a line-interactive UPS (buck/boost system) and the system is constantly boosting, it may not be charging the battery. If there are frequent brownouts and undervoltage conditions on the incoming line, the system will not be charging the battery. In order to be able to charge, it cannot be boosting the line due to an undervoltage condition since it requires a greater voltage to charge the battery that the voltage of the battery. For example, to charge a 12V battery, it requires a voltage of 13-14V. When a line-interactive UPS is boosting the line voltage, the additional voltage is going to the output, not the battery.

    Fourth, assuming a line-interactive UPS and it is not boosting, it would seem to indicate that there are issues with the battery itself not being able to provide the required power during an outage.

    Fifth, assuming an online UPS, the issue would be with the batteries since it is isolation system and the output power is always being supplied by the inverter (there is no switchover time and the batteries would immediately assume the full load upon power loss by simply dropping out the rectifier circuit).

    In your case, I would assume it is one of the first 4 items in the list, but if your power is that noisy, you should look to using an online UPS instead since it will completely isolate your computer from the noisy line power and eliminate the switching time incurred by the other systems. Although, a ferro-resonant system can also aid in reducing the impact of switching incurred on the less expensive UPS systems as well.

  10. Wong Wee
    February 12, 2013 at 12:51 pm

    Does your UPS come with any software that can interface with the UPS?
    Something like PowerChute for APC UPS.

    There should be some diagnostics you can perform on the UPS to determine if there are any problems with the UPS.

    A quick google shows that it's either:
    1) UPS battery is faulty and requires replacement
    2) Your power grid is experiencing brownouts (dip in voltage that is below your PC's operating voltage but above your UPS cutoff voltage)
    3) Your PSU is faulty and cannot handle the cutover properly

    Does your UPS work properly when you cut the power manually? (ie, you switch off power to the UPS/PC)

    • arjun
      June 6, 2013 at 4:16 pm

      i have experienced the very same problem and my ups is working properly when you cut the power manually...bt not at powercut...why ds happen????

  11. Aska Nag
    February 11, 2013 at 10:55 pm

    Maybe the problem is in the output of the failure of the UPS battery, if there is a possibility to try another UPS to test this version.
    Best regards!

  12. Jim Chambers
    February 11, 2013 at 8:23 pm

    With that much use the battery in the UPS may have failed since tha only have a life expectancy of 3 years max. I don,t think its a good idea to keep running your computer on the UPS as its only ment to give you time to save your work and safely shut down the computer when outage lasts more than a few minutes. Have the battery tested to see if it charges properly. Replacements cost about the same as a new UPS.

  13. susendeep dutta
    February 11, 2013 at 4:34 pm

    It seems that your capacity of UPS is lowered and needs to be recharged for upto minimum 8 hours or more depending upon its capacity.If you use it extended for long time(as you mentioned "keep it running with my monitor off if some download is running") then it needs to be recharged for that long time.

    • Osama Javaid
      February 11, 2013 at 6:09 pm

      u didnt get my question

      • susendeep dutta
        February 12, 2013 at 2:25 pm

        I did got to understand your answer.I also have experienced the same issue.You PC gets restarted when there's more load or less battery power on UPS.

        So,the first thing you can do is to charge it for 8 hours.

  14. Jan Fritsch
    February 11, 2013 at 2:57 pm

    Given that it worked before I would assume that simply put your battery and UPS has aged.

    Depending on the type of UPS it does take a certain time (delay) to switch from the power line to the backup battery. Over time and usage that delay will increase duo to aging. So most likely it has reached a point where it doesn't switch fast enough to keep your system running.

    The other option is a dead or overloaded battery. If the battery cannot supply enough power for all connected devices it will obviously cause them to lose power too.

  15. fritz Richard
    February 11, 2013 at 2:01 pm

    Maybe there's some cleaning to do on your UPS. Have you tried cleaning it? If not, you can do that by a blower/vacuum cleaner.

    • Osama Javaid
      February 11, 2013 at 6:08 pm

      Unsatisfactory answer

      • fritz Richard
        February 11, 2013 at 8:45 pm

        Have you tried it? I hope you try it first. Clean the inside of your PC especially the power supply. Open up the PC, reseat everything--memory, processor, video card, etc. So your PC will be refreshed. Overheating is mostly the cause why the PC restarts. Worse scenario is you have to replace your power supply. There can also have settings for the UPS to tell it to opt in sooner. Otherwise, you should probably replace the UPS with one that have a more reliable trigger. Power surges can damage UPS.

  16. ha14
    February 11, 2013 at 11:52 am

    try to reset cmos battery, remove ram clean them and see if it will correct your problem. If not perhaps to update/flash BIOS...

    • Osama Javaid
      February 11, 2013 at 6:08 pm

      what has cmos battery and RAM cleaning to do with this?

      • ha14
        February 11, 2013 at 6:24 pm

        if charges left inside the hardware then this will clear them, also will reset some settings. No harm done i guess.

        To configure an Uninterruptible Power Supply (UPS) device
        [Broken Link Removed]

        To configure a simple-signaling Uninterruptible Power Supply (UPS) device
        [Broken Link Removed]

        Windows Shuts Down Your Computer When the Uninterruptible

        How does a computers uninterruptible power supply work?

        To determine how powerful of a UPS you need, first use the Journey Systems Power Supply Calculator to calculate your computer's wattage requirements. Take this number and add it to the wattage requirements for other devices you would plug into the battery backup. Take this totaled number and check with the UPS manufacturer to find your estimated battery runtime when you lose power from the wall.

  17. Junil Maharjan
    February 11, 2013 at 5:09 am

    The load of electricity that your pc needs is not being supplied by the ups. heavy electronics like tv, pc, etc. need a lot of power. or it happens due to the changing of electricity supply in the ups.

    • Osama Javaid
      February 11, 2013 at 6:08 pm

      but it was running fine for over a year

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