Our pre-lit Christmas tree is about 7 or 8 years old. Ever since the first year, there has been one section that won't light up. It's not even always the same section. I usually fiddle with it for a half an hour or so and then ask my husband for help. He usually manages to configure the six billion plugs so that all the sections light up somehow.
Well, last week we put up our tree the day after Thanksgiving. Since I was busy baking cupcakes, my husband took on the job of assembling the tree and tackling the lights. As predicted, one section would not light up again. After trying all possible configurations of the plugs, he concluded that we must be missing a bulb or at least have a loose one. I don't know how he had the patience, but he went through each bulb on each branch one at a time. I think I would have thrown the tree out the window before I got through half of them.
Well, thank goodness for my husband's patience. Look how pretty our tree looks!