Screw that's loose and stripped.
Screw that's loose and stripped.
Assume the screw is threaded in the opposite direction. Remove the mobile part (if the standoff spins with the screw, you’ll just remove the standoff from the case) and pull the mobile out. Then position pliers on the stand and unscrew the screw from there.
You're asking about a situation where the motherboard isn't coming out of the case. It sounds like you're struggling with a cross-threaded screw that's hard to remove. Try using a sturdy screwdriver, grip the stand-off firmly, and apply strong force. Make sure you have the right tool to avoid stripping the threads. Once they're loose, discard them as the damage is likely done.