I'm an utter newbie. I bought a grow light for my first grow from Inside Sun. The 400 watt. The ballast hums when plugged in but the bulb wont power on. I am clueless how to troubleshoot this. I don't know if something I, in my newbiness, need to do or if the bulb or ballast are defective. All I need was screw in the bulb and plug the thing in. Anyone have any advice?