Bob is correct, the light blinks when the shutter closes. Check the small finger crank on the film back to see if it moves when the camera advances to the next frame. Just like on a 35mm camera when you racket the film lever you will see the film rewind knob move. Develop the roll you have already taken, it may lead you to discovering what the problem is. And who knows, you may find you took a complete roll of usable pictures. If not return the back to KEH.