回答“My hinge on the left side is broken.”Your hinges are probably fine. It’s the screw bosses that the hinge screws screw into that have come free from the bottom case. Many laptops that have a plastic chassis have this problem. Lenovo advertised this laptop as having “reinforced hinges”, but there is no reinforcement to be found inside. Interesting! You can try using epoxy to repair the mounts in which the screw bosses reside, but I suggest getting a new bottom case.