Hello folks.I have a 5 tier light installed in the living room.One bulb fused so i decided to change it with the mains on Silly i know.When i did,the light shorted out and went off.I assumed the MCB tripped and that there was nothing to worry about.I then replaced all the bulbs with new ones,reset the MCB (lever type) and turned the switch on.Light wont come on.Thought maybe light was dud.Checked for power through the wires,nothing.What could possibly be wrong? Any help would be greatly appreciated.Merry christmas and a happy new year.Regards Sam