Looks like the Graflock bars have slid closed and are catching the back mechanism. Try pushing them out of the way.
Jack, thanks, I'm a newbie, this is Sinar btw. Don't know even what Graflock bars refer to and where to push, so unless you can make a quick video, maybe I can PM you?
Just look closely. Surely you will find Part A interfering with Tab B.
All seriousness aside, Graflok bars are along the top and bottom edges of the film back. They slide to grip optional film devices such as roll film holders and Polaroid backs. When not in use gripping something they should be slide along their tracks to a neutral position. Usually they are two long thick bars of chromed flat metal with a bit sticking up on one end that allows you to push on it.
Sorry, I can't help more, I own Cambo cameras, not Sinar.
It's a little hard to tell from your photo,
1. is the ground glass even attached?
2. Are the silver parts with the hooked ends stuck in that "distended" position? If so, you have a small problem I used to see with Cambo cameras when newbies pulled the GG frame too far away from the body of the camera and the spring that holds the hooked parts pops out of place.
Answering these two questions will help us help you.
What Tracy said.
But from your photo it does look like the large silvery rectangular piece of metal (that's cut away so the sprung arms can slip through and engage) at the right side of the back as it appears in the photo is sticking out (to the left in the photo) so the back is hitting it and won't close. That would be what's being referred to as the Graflock bar, although being a Linhof person I'm not sure the Sinar even has such bars. Most cameras do so you can take off the ground glass frame and slip in some other holder like a roll film or Polaroid holder.
A few photos from different angles would also be helpful in diagnosing the problem.
Why not add your location to your profile? Then someone who lives nearby can help you.
I am no expert, but perhaps the black bar below the silver bar is moved to much, maybe if you can get assistance, one person can hold the back, while the other one tries to move the black bar. Or alternatively you can try to push back/in the silver bar at the serrated part, and remove the back completely.
Good luck,
best,
Cor
It might be clipped on backwards. Try removing the ground glass part, then flip it around 180 degrees.
Couldn't hoit!
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