Have you tried direct wiring the motor to a battery? Try that out, see if you can get the motor to work. If you can't it's the motor itself that is bad. At least you should be able to get the window up that way.
I am going to take a stab in the dark with this one, and say ignition switch. It may not be working fully sending power to all the wires when the switch is on. It's a pretty simple fix, not too expensive either.
Good Luck!
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