I have a strange problem, with an A77. When I attach a lens on my A77 I hear the shutter after 1-2s and I got the camera error on the screen. Happens also with different lenses.

When I dont completely attach the lens, I can take some pictures without a problems. As soon as I attach the lens completely, I got the camera error :-/

I know its not the mainboard, the shutter, the mirror box (bought a new one) and the ccd sensor.

Somebody had this error before?