Hey guys, I'm new to TalkBass. I've had my Epiphone Thunderbird Pro-IV for about a year now, and I decided it needed a tune up. I tried to adjust the truss rod and tightened it until I didn't feel comfortable tightening it anymore and it still did not affect the neck. I relieved the tension on the neck and stupidly left the string tension on, which caused a bow in the neck overnight. This isn't the real problem though, as it seems that no matter what I do with the truss rod the neck doesn't budge. I've had my buddy look at it and he says that the truss rod doesn't show and obvious signs of being broken (rattling, no tension when turned). Does anybody know what could be wrong with my bass?