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From the PR2 Manual (http://pr2support.willowgarage.com/wiki/PR2%20Manual/Chapter3):

When plugging in the PR2, always attach the power cord to the AC inlet on the robot before attaching it to the AC outlet on the wall. Unplug the cord from the wall before unplugging from the robot.

Plugging a live AC cord into the back of the robot can cause arcing, which can deteriorate the power inlet on the PR2.