Wouldn't fluctuations in his power show up on his meter? Just wondering though as I've never had this problem but I would assume that the output the power supply is showing would indicate that thats how much it's outputting at that moment and any fluctuation would show up. Also, does your coworker have any problems? You stated that you plugged an extension into his outlet and things didn't change for you. Well, if he has problems too then it could be the wiring of the building as others have said. If your coworker is all good then I don't think it is the power. Just my guess though.