There are lots of things that could cause this. I see you said you charged your batteries which is usually the first problem. Let the saber sit for a day and then try it again, sometimes funny things happen for no reason.
It is likely that either A) something has become disconnected or B) something has become shorted out. I'm assuming that your sound still works if you have it and the RG is still working too so B isn't very likely. Worst case scenario the blue LED somehow died (any mass produced product can have a faulty production).
Email
[email protected]. I understand your shipping concerns. If you can safely get to your sound board you can have anyone with skills in soldering take a look and make sure that none of the joints have come undone, and you can check any Quick Disconnect ports yourself.