I recently purchased an OM-2n from a member of another forum. When I opened the box I noticed that the mirror was in the up position. Turning the meter on/off switch to the battery check/reset position released the mirror. Then I could fire the shutter one time, but when I worked the film advance lever, the mirror again snapped into the up position and would not come down until I again moved the meter on/off switch to the battery check/reset position. This appears to be true with both manual and auto exposure. Any idea what could be wrong? I used OMs for 13 years and am pretty familiar with them but haven't encountered anything like this before.
It's a nice camera otherwise and I would like to keep it, but if I can't find a solution to this problem I will have to send it back.
Try a new battery ----
What he said ^^^^^
As the others said; it needs new bateries