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Another way to tell if the motor is getting any juice is to turn on the headlights at night and then try the stuck window. If the lights dim slightly, then you know it's getting juice but it must be mechanical problems (this happened to me). You can also see a slight voltage dip from the voltage gauge.
No dimming or voltage dip, then you've got electrical problems you'll need to trace......Look at the fuse box. I believe it told me which one was for the driver's door window