THEIR LED LIGHTS WON'T TURN ON!

Ugh, that is so frustrating! I need my LED lights to work, but they just won't power on. I've verified the fixtures led xmas lights dim - they seem fine. Maybe the wall switch is {the{ problem? I can't know what else to try! Any ideas would be really appreciated! Identifying Faulty LED Lights When your LED lights start to fail, it can be a pain