>>You might also check to see if the battery in the UPS is charged - log off your machine (leave it running) and pull the A/C plug from the UPS to the wall. See if the UPS keeps your machine running.
>
>Even if you're logged off, Windows won't like it if the power goes off unexpectedly. For UPS testing, it's better to boot from a LiveCD/LiveDVD/LiveUSB (Knoppix, Ubuntu etc.) or even boot from a DOS floppy if your machine still has a floppy drive.


Actually that has been our quick and dirty way to test UPSs for many years.

I wouldn't do it with a server or a workstation that for some reason is being used as a server, but otherwise we don't have problems doing it (windows will give you the boot menu on re-start).

If we really wanted to be safe we'd either boot DOS or bring it up to a BIOS screen.