How to best diagnose and repair electrical issue.
Run your own ground, a #14 wire daisy chained from one piece of equipment (TV, computer, UPS, etc.) to another with the far end connected to a known ground which could be a radiator. Attach it to equipment either to a screw that goes through the cabinet to the chassis, or to the shell of an input jack that has such an outer shell.
Are you sure that your one grounded receptacle is indeed grounded? You can probably assume it is grounded by connecting a 100 watt incandescent light between hot and ground and then measuring the voltage across it for the proper 120 or so. Short wires with alligator clips on the ends can come in handy here.
Also you can check the voltage (hot to neutral) yourself at your convenience.
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Last edited by AllanJ; 08-29-2010 at 07:13 PM.