I own an '01 Impala, and my driver's window went out about three years ago, but the rest of them worked fine. Then, a few months after, the back left window would roll down, but not up unless I rolled it up on my driver's window controls. One day I was trying to roll my windows down when all of them stopped working, and every time I pressed the button, the light would flicker. Now, there are no lights that work on it, and when I press the button to roll down driver's window, it makes a buzzing/grinding noise. I've had someone check all of the fuses, and they were all fine. Any thoughts as to what or where the problem could be? And is it an easy fix or will I have to take it to a shop?