[bojan]

Hi guys,
recently I have a problem with my Canon 400d, sometimes there is a message on the screen that says "error 99, shooting is not possible, Turn switch OFF then ON, or reinstall battery".
Also, sometimes images are dark, like something was in the light path (mirror?)
Anybody knows what that may be? I know that 300D has a plastic pin that sometimes breaks and prevents focus mirror from moving away so it remains in the light path and as a consequence the lower part of the image is shaded.. but in my case it is the upper part, or so it seems. Very strange..
The problem happens maybe after 5-10 iamges (after power OFF ON)

EDIT:
Error 99 is happening with or without lens in place, with or without CF card.. so it is something internal.