2008 Mitsubishi Colt covertible back Window not going up
 

Hello,

I have a 2008 Mitsubishi Colt Convertible, the car is running good and I have no problems except for the back window behind the driver will not go up.
I have not put the roof down, the window has just dropped.
Would anyone have any ideas as to why this may of happened and what I can do to fix it?
I have a few ideas to what could be the issue but just wondering what other people may think.

Thank-you!
Fern