Low battery warning on desktop, running on AC power!

I have one user with a Dell Vostro 220 desktop, that has an APC UPS 350 as their battery backup/surge protector, that will get pop up warning that battery is low & should switch to AC power. The computer will shutdown at that point, but will start back up no problem. THis was in a new building & AC outlet had checked out ok. I have also replaced the power supply, but the problem is still there. Even stranger is the fact that I replaced her computer with an older one I had back in the server room (optiplex 380, if it matters) & it has been ruing fine for a day now with no problems. I have her old computer in the server room & it has been running fine for a day. That might make me think it's in the UPS, but I have aleready replaced that once over the past couple of months.
Any suggestions?
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I have seen the Low Battery warning in XP several times, but they never shut down.  Very strange.
Have you tried a different USB port on the computer for the APC connection?
Don ThomsonCommented:
It's the old case that too many bells and whistles causes more problems than they are worth.

Dell  Monitors the CMOS battery on the Motherboard  and reports when it is dead or dying. Most other brands do it when you restart or start your Desktop.

I would suspect that the CMOS battery (Usually a cr2032)  has gone flat

The way to find out for sure is to unplug the Desktop from the power for about an hour - Then start it up and go into the Bios - If the time is wrong - then replace the battery. If not then the registry thinks that the desktop is actually a laptop and as it can't see the "battery" then it is giving you the warning.

But - I think you will find it is the  the cmos battery on the motherboard
Is the system using windows default drivers for the UPS. for the the UPS or has the APC software and driver been installed??  If APC make sure it is most recent and if it is try uninstall and reinstall,  as when its hooked up else I'm betting you don't have com for the UPS connected to system.
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you can measure the battery - it should read 3 V
or just replace it, it is an CR2032 model - about 4$
gromackAuthor Commented:
Ok, thanks for all the advice, but it's looking like its a power issue in the building. As I said, I left users problem computer in the server room up & running & haven't had the problem happen since & just today the replacement computer I set user up with started with the same error messages! One of the other people in the office ran an extension cord from another office & no more low power warnings. I bought a new UPS with the AVR option, hoping that will fix my problem, until I can get an electrician back out there.

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gromackAuthor Commented:
I replaced the ups & problem has gone away.
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