The $30 20 minute fix. Go to home depot and get a run of 12 gauge green wire, a pair of wire strippers and a pipe ground. Attach the pipe ground to the cold water pipe in your basement that comes from the street. Attach the wire to the pipe ground and run it into your studio. Turn off the circuit breaker and open the outlet(s) and remove the ground that is there and replace it with the wire from the basement. Turn on the circuit breaker. Done and done.