Wait.. UPS.. aren't they specifically meant for protecting against power spikes and surges as well as providing power during temporary power failure?
If all 3 died they were either buggy or there's some fuse in each one you don't know about.
Ph'nglui mglw'nafh Cthulhu R'lyeh wgah'nagl fhtagn!
"The sky was the color of a TV tuned to a dead station" - Neuromancer