Originally posted by Na Horuk but some SLRs require a button combination when you rewind the film, or they will overexpose everything.
Huh?
To the OP...Have you confirmed that the shutter is operational? You can do that by dry firing the shutter with the back open and looking forward through the lens from the back (aperture full open) at a bright scene. Even at the top speed you should see light through lens. Repeat for all speeds.
If the shutter is opening, the above comments regarding fail to wind onto the take-up spool apply. Everyone who has ever owned a 35mm film camera has had that problem at least once.
Steve