>>3166806>Brown, with spots towards the bottom edge being off-colored. Does not eject the film.
That sounds like the cartridge is too old. The developing chemicals built into each piece of film only last for so long, and pretty much all Polaroid film produced pre-Impossible-Project is beyond that point now.
All black means something wrong with the camera. All brown means the film is too old and won't work. You can buy new film from The Impossible Project for Spectras and it should work.