The right hinge of my DSL broke. But I don't know if the hinge itself is broken, only the plastic covering it broke off I think. The system still works fine, but the top screen is only hanging on by the left side. I've searched for replacement cases and I've found some that offer new hinges. How can I tell if my hinge is broken because it just looks like the plastic broke? My L button is also broken. It only works sometimes if you blow into it or press very hard. Can I repair it by changing the case?