Quoted from 6point5degrees:
Is this a simple bulb replacement? Odd that both ends of the bulb are still lighting up.
Forgive my ignorance, but I purchase a replacement at Home Depot, for example?
Yep totally normal for a bad fluorescent bulb. Replacement from Home Depot or wherever will get you back up and running.
Sometimes you can actually run your hand over it and get it to kick on.