I had nothing but problems with mine, after eliminating all the redundant plugs, swapping out for a refurbished motor, new cable, new window switch, greasing up the window regulator, and bypassing the safety switch it finally works like it should.
From what you describe it does sound like a bad cable or it may have came loose at the motor, you may have to bypass the safety switch and with the tailgate down have a friend gently pull on the window while you run the cab switch to roll it up.
Don't go too far out with the window because there isn't anything supporting it and it may damage the tracks, those windows are heavy.
If by then you were able to roll out the window, disconnect the cable from the motor (assuming the glass isn't in the way), and use a cordless drill and slowly run the window in or out with someone supporting the glass, that will give you an idea if the cable is stripped at either the regulator or the motor.
However that is only one thing out of many that can add up to cause problems, those motors are pretty weak and the contacts in the cab switch tend to arc and deteriorate, same goes with the safety switch.
