Originally Posted by
Bonebreaker777
Could it be that the screw was too tightened during installation and now when he tried to undo it, instead of unscrewing the screw from the metal hex nut, he just unscrewed the metal hex nut (with the screw still fixed in) from the motherboard plate. If that is correct, all he have to do now is to take the motherboard out, cause theoretically nothing should be holding the motherboard in any more (beside the I/O shield). Once the motherboard is removed, he can undo the screw-metal hex nut pair.