If it won't roll up with either switch, then chances are you have a dead motor. They're brush motors, once the brushes get thin it's not uncommon for them to work fine one moment and then simply quit. If it will roll up from the passenger switch but not the master, then it's probably a bad switch. To confirm whether the motor or switch is the issue, pop the switch out and put a test lamp across the fat blue and green wires. If the lamp lights in both directions when you work the switch, the motor is bad. If it doesn't then the switch has a problem. Note that it's very common for dying motors to draw very high current and burn up the ground pin on the switch connector, so check that before condemning the switch itself.