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

Oh no, it sounds like your pre-lit Christmas tree isn't lighting up. There could be a few different reasons for this, such as a burnt-out bulb, a loose connection, or even a problem with the wiring. First, try checking the bulbs to make sure they are all firmly in place and not loose or broken. If they all seem fine, try checking the wiring for any loose connections or damage. If you still can't figure out the issue, it might be a good idea to call an electrician to come take a look and help you out.