Quote Originally Posted by rthomas View Post
I've never heard of this happening either. Does it happen with all lenses or just one specific lens? If you haven't already, try taking off the lens, opening the back (remove the film first of course), and pressing the DOF button while watching the shutter to see if it is firing.
It happens with all the lenses I've tried, and it does it without a lens. The shutter fires and the mirror lifts, just as it does when the mechanical shutter lever is pulled.

I happen to know this body was stored improperly for 10+ years; it sat in a cardboard box with the shutter cocked, battery installed, no body cap, no anti-desiccant, no exercise of the shutter.