I have an Ibanez ART300 and I opened up the back of my guitar and saw that there was a black wire that wasn't attached to anything right next to the jack. The black wire has a few tiny frayed wires at the end and I think it is supposed to connect to the back of the jack cause there is a little metal loop sticking out of the jack. I don't really know how this works. I think it might be loose because when i got it (my first guitar) the jack was loose so i tried to tight it from the outside just by twisting it and it might have loosened that wire. Please help
Sounds like you broke one of the wires loose going to the jack. Can you post some pics? It probably just needs to be re-soldered to the "little metal loop sticking out of the jack" you mentioned in your post.