First thing I would do would before resetting the breaker. Check rest of house and see if anything else in the house does not work. This is a simple way to determine if the breaker is feeding more than the plugs in the room you have your pcs in. You may have something else drawing power from...
I recently had heat issues from new drivers and game crashes. I reverted back to Nvidia 8.17.12.6724 driver date 2/23/11 . Worth a try. My 9800GX2 shot up to 98 in game when I updated. When I rolled back to this version my temp runs @ 74 in game:)