5D MkIII Shoots once then dies

[Blackbird2021]

I turn on the camera, everything works, all the buttons, dials, focus, etc.  As soon as I take a shot, the camera shows the image in the screen, then everything shuts down - all the buttons, dials - focus still works, but I can't shoot.  I have to take the battery out and put it back in then I can take one more shot.

The problem started yesterday while using a Sunpak DigiFlash 3000 - I assume this is related to the camera problem.

The problem persists whether I am trying to use the flash or not.  All settings reset to default.  Flash disabled.  Still doesn't work.  

[Blackbird2021]

Removed flash, reset camera, problem persists.  I too suspect the cheap flash.

[Waddizzle]

Sounds like your issue could be related to the flash, especially if it goes away when you are not using it.

[Blackbird2021]

The problem doesn't go away when I don't sue the flash.  Flash or no flash, my camera is now a one-shot camera.