Window is not going up now

I have an A2 Audi car with the front nearside window stuck down, when operating the electrical switch the motor starts for a brief second then cuts out. I have removed the motor assembly & managed to raise the window manually, it is however very stiff. The nearside Front window is stuck down, I have removed the motor assembly and managed via turning the gear wheel to raise the window. The gear wheel was very tight to turn as if something is jamming. As I do not want remove the whole inner door panel unless I have to, I first ask what the problem can be.