Screw on the motherboard is lodged.
Screw on the motherboard is lodged.
You need to carefully remove the stuck screw. Try loosening it gently with a small tool, then check if the board stays secure. If it doesn’t, consult the manual or a professional for further steps.
No, it's not a screw for mounting the motherboard to the chassis. It's designed to fit into a standoff for that purpose.
The standoff wasn't secured properly, or the screw was forced too hard. You'll need to remove the other screws and the motherboard. After that, find a socket matching the standoff and use leverage to take out the screw, or employ pliers for better grip.