Help please! lights in the hallway working upstairs but not in the three bedrooms. All floor sockets work fine. I have a MK Sentry consumer unit. (no fuses in it) Have obviously checked that the switch for upstairs lights is up, which it is. Checked all ceiling light fittings and found that one had a dodgy light bulb fitting. The bulb wasn\\\'t catching properly and was at an angle. Could this be causing a short circuit, which could have blown all three lights? What should I do?