I have a APC UPS that backs up my computer, monitor, and alarm clock. After I bought it, I noticed that it had a grounded plug (three-pronged) and that my wall outlet was two-pronged. So I used an adapter to "convert" the wall jack from 2->3 prongs. The UPS works fine, but it has a light that stays red and reads "wiring fault". Does anyone know if this is something to worry about? The manual said nothing other than "hire an electrician to convert the outlet". Thanks.