I just picked up a single wide black tower and have a small problem. This style has fluorescent lights on top and bottom with separate ballasts at each. When I got it home and fired it up yesterday all lights worked. While sitting there the top got dim. I removed the top cover and discovered one bulb had burnt out. So I replaced that and now the entire top won't light but the bottom is fine. This leads me to believe it has to be the ballast went bad? Now this is where my intelligence ends and I ask for your help. Do these go bad? Are new ones easy to locate? Is this a fix that I can handle or do I need to get an electrician? Any and ALL help would be super appreciated as the excitement of my acquiring my first display case has been saddened by the immediate problems with the lighting.