If the LED panel lights are not turning on, here are a few things to check: If the lights are plugged into a power strip, confirm that the power strip is powered on. Make sure the AC adapter is properly plugged into an outlet and snuggly into the LED panel lights. Check that the power switch on the back of the LED panel lights is in the "on" position. It's possible that the switch was accidentally turned off. Some of the lights have a clear On/Off while some of them have O, I, and II. The correct mode for those lights is II. Confirm that the cables connecting the LED panel lights to the power adapter are secure and undamaged. If these steps don't resolve the issue, we recommend reaching out to our customer support team at support@studioupgrade.com for further assistance.