They're practically brand new and still under warranty. I contacted Current USA and they said I should replace the bulbs and possibly the ballast. Not such great troubleshooting advice from them... I don't want to spend MORE money to get the lights that should be working without my intervention. AND it took 3 tries and 3 sets of lights being shipped by UPS before I got 1 good, undamaged unit. I do not want to have to rely on UPS again...