I have 8 lights up on the living room ceiling and one of the lights needed a light bulb replaced. Replaced that bulb and now only 4 are working. They were all working before I replaced that bulb. Any...
It is not a fuse if they work off same switch. Type of light fixture and type of lamp would help. My guess is more like the stab in type wiring in the back of some got disturbed when you replaced the lamp.