Cool Green Light Doesn't Work On Led Strip References. There are several common issues that can crop up with the power supporting your led strip lighting. This can be caused by a faulty controller, incorrect wiring, or simply having too many green leds in your strip.

If this doesn’t fix the issue, move on to step two. If the led works, it should only light up very dimly. You’ve wired up your led lights, but when you hit the switch, they don’t turn on.