How do you get a string of Christmas lights to work?

Last year I bought a bunch of strings of clear lights from Walmart to go on my Christmas tree. I got them out the other day and tested each string and they worked fine. After spending hours putting them all on my huge tree, I found out that when they were plugged in together one of the strings will not work. The string worked fine when plugged in by itself though. I tried changing the fuse but it still doesn't help. I figured maybe rigging an extension cord up to that one string might work, and then hanging it down the back of the tree. But I don't want to create any fire hazards by doing so. Any suggestions?How do you get a string of Christmas lights to work?Actually, your extension cord idea isn't a bad one. They make extension cords specifically for trees intended to go up the trunk, colored green, and with three outlets space a couple feet apart. You could get one of those and plug all your lights into it instead of end-to-end like you've done, or just the one troublesome strand.How do you get a string of Christmas lights to work?Just one string? You could try taking it off and plug the others into each other and if they work just buy a new string to put in that ones place. You could always use those in a wreath or something. That is really weird thoughHow do you get a string of Christmas lights to work?did you try connecting it to a different strand? maybe the connection point you have it in is out of wack. so try switching it up and the one that it connects to is last so nothing gets connected to itHow do you get a string of Christmas lights to work?you may have to check the bulbs on each of the lights on that particular strand. It is annoying, but it's your best bet