MacBook Air broken hinge repair replace - How to fix a loose screen
Get replacement hinges on ebay dirt cheap. You will need some small screwdrivers and pliers to squish the new hinge on.
Macbook Air Hinges on eBay: http://rover.ebay.com/rover/1/711-532...
Several people online are saying that you need to replace the entire screen, the whole top half of the computer! That's insane! Ignore them.