Ok this problem was here before i bought the car, ok on both back passengers sides both windows wouldnt go up all the all and just untill later today the Rear left power window fell and when i hit the switch i hear a noise like its trying to go up but it doesnt so can you guys give me some info on what it could be that they dont go all the way up for about 1 inch and could that of been a developed problem that let the rear left window to not go up.

p.s. right now from a visaul check i can see that metal wire that is supose to be going up or something hanging out and i have it tacted down to the frame to keep it from falling and i have a system hooked up in my car so could the bass of made it go bad.