I doubt if seven lights are run off the one transformer. I suspect it is a bad connection somewhere. take the associated switches off the wall and see are any wires hanging out but be very careful, you should turn off the trip first. if thats ok, see have you power going to the bulbs by checking with a multimeter, if you can get hold of one.Beldin, the're the GU10 type, seven of them just went out together. I'll check if single transformer (can anyone do this?) - could it be anything else? Thanks very much all for responding.