i am having an inverter inaddition having an 1100va apc ups... it was working fine.today when the power came after shut down my ups dropped with continuous beep sound. my cpu ve 650watts corsair smps. but till date had no overload prob.. so i disconnected the ups from power cord and seen everything working fine.Again atonce i connected to power it went down with beep sound continuously..What is happening any help 4 me? am worried about my PC.