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If you remove your door panel, and look at the guts of the window mechanism, you'll find a motor that should move the window up and down. The gear on the motor is probably either stripped, displaced, or the window regulator (the other half of the system)'s gear teeth are similarly damaged/displaced.
Firstly check the wiring then motor is only working one way that means that the power is not being reversed to put it back up, switch the wires around from the switch if it go's back up then you know there is a wiring fault.
I had the same problem with the pwr window PS recently. Took it to the Chevy dealer and they replaced the window motor and said that there was a short in the window motor (cost $270). It worked fine for two weeks... Now, suddently, there is no power to neither windows, the radio nor the IP dimmer. I am guessing I have now the short on the DS motor window.
A couple of things that can happen. The switch is bad or the motor regulator is bad. Either way the best way to check is to open the door up and disconnect the motor and ground one terminal and supply battery voltage to the other. You might want to use a fused wire to do this just in case the window motor is shorted out. You can reverse the ground and positive and the window will operate in the other direction. if the window moves the porblem is either the switch or you have no power to the switch.
I had the same problem...it was the window gear that got stuck when the window was all the way up. (that's the clicking) I took my panel off and banged on the inside of the door with a rubber mallet. The window works again. Since then I make sure when I role the window all the way up to stop that I just barely tap the down button to release the pressure on the gear inside. When your using the hammer...hold the switch in the down mode...ignition on of course.