how to fix lights on christmas tree

The first thing to check is whether or not the power outlet you're using is working. Try plugging something else into the outlet and see if it turns on. If the outlet is working, then the problem might be with the lights themselves. Check the bulbs and make sure they're all intact. If a bulb is broken, it can cause the whole string of lights to stop working. You can also try replacing the fuse that's in the plug, as that can sometimes fix the issue.