Can't open rear hatch 2003 2-door 4X4
 

I have a 2003 2-door 4X4 Chevy Blazer. All of a sudden I can't open the rear hatch/window. When I press the button on the dash or use the key fob all I get is a noise at the latch area, but not the click that I usually get.
How do I get this window open manually? There is a black button on the exterior of the tail gate. It's spring loaded. It pushes in, but does nothing since owning the car. Is there another way in? Kind of a pain not having that rear window and tail gate open.
Thanks

119 views but no suggestions. Am I on the wrong forum?