I was working on adding a duct run from the furnace (95 Comfort R). I made contact with the metal duct and the thermostat wire and the furnace stopped running. I thought I broke the thermostat wire, so I replaced it. I don't have power from the furnace to the thermostat (Honeywell TH6220D), so I am assume the problem is in the control board. Do I need a new control board? Is there a check I can do before I call the repair guy?