what to do when pre-lit christmas tree doesn't light

It sounds like the bulbs on your pre-lit Christmas tree may have blown out. The best way to fix this is to replace the bulbs with new ones. You can purchase replacement bulbs at your local hardware store or online. Be sure to purchase bulbs that are compatible with your tree's light socket size. Once you have the replacement bulbs, remove the old bulbs and insert the new ones in their place. Your tree should be lit up again in no time!