The Sutton Designs Netsavers WebUPS UPS Systems will protect your Computer from power outages and power disturbances. If your computer monitor exhibits interference, first test other configuration combinations, so that a configuration problem can be ruled out. For example, try reconfiguring the monitor under the Custom Monitor option in the monitor installation SW and selecting the 800X600 -72 Hz setting, if there is one. This could still be magnetic or electric field interferences. You can rule some of these possibilities by a few simple tests.
Monitors are very susceptible to electromagnetic fields.
Reposition the monitor or move it to a different location. If you have an extension on the monitor output cable then remove it as well. Try swapping out the monitor to verify if it really is the monitor or take your monitor to another system and see how it responds there. If you are plugging the monitor into a surge strip, remove it from there and plug the monitor directly in the wall outlet. Don't use devices that dump current onto the neutral line, and have an electrician correct the wiring to NEC code.