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Please do not rate me until we have finished our dialog and you can rate me as "excellent" service. Thanks for the opportunity to help.I see you have waited a while and none of our techs have picked this one up. Let me try to help. The sensor checks for high amp draw, voltage, or grounding issues. The fact that your laptop also gave you this warning at one time confirms this. The most likely issue is just a bad receptacle. If the receptacle is replaced and problem still occurs, the next step would be replacement of the breaker that controls that circuit. Although the receptacle itself is a far more likely culprit.