Are you saying that the main breaker in the circuit breaker panel is getting tripped when you turn on your PC? If so, that is a pretty serious situation. If is is just an individual breaker circuit, then you need to figure out which outlets are on that circuit, and as said above, balance out the load by unplugging other devices on that same circuit. I made a schematic of my entire house by plugging a radio into each wall socket, and flipping off various circuit breakers, listening to when the radio quit playing. Also did the same turning on various light switches and flipping the breakers one by one. Took about a day to do, but I have two 100 amp breaker panels completely full.