Recently purchased a house and got the electric upgraded from 100 to 200 amp but a couple of lights stopped working after moving in. We were not able to figure out why and asked a handy man who still could not fix either light. The house is over 100 years old and still has nob and tube in some places. My question is if the upgrade had any thing to do with the lights not working anymore? The first one is an old dining room chandelier (wanted to put a dimmer on it). The other light is in a small room off the kitchen that has a electrical boxes running from the ceiling to the switch on the outside of the wall (b/c it has stone walls). What could the problem be? I would like to fix the problem without calling another electrician (man are they expensive).