Vivitar 283 won't fire
Since the flash is working on test, it means the connection to the camera via the hotshoe is not working. With the flash on and ready light showing that the flash has charged, take a small thin copper wire and short between the the metal spring on the side of the hotshoe (in the slot) and the round metal contact tip of the hot shoe. This should cause the flash to fire if the internal connections to the shoe are working.
If the shoe is working then it must be the camera that is not working. Many modern digital cameras cannot fire older flashes directly, because the voltages on these older flashes are too high. This could damage the camera or if the camera has protection against the high voltage, that will make it impossible to fire the flash. In that case you need an adapter. These are available cheaply. You should try borrowing a modern flash to test that your camera is still working and has not been damaged, if it is a modern electronic camera.
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