PLEASE READ! Might help some of you outI fixed my cracking hinge problem myself. It can be done!
I encourage anyone else to do the same. I followed FiZi's guide to disassembling the LCD screen, which was fairly simple. Once disassembled you can see what actually causes the crack. First, the left hinge (facing the laptop as you normally would) Is too tight. So to correct that problem I pulled out the hinge pin from the holder. This pin assembly consists of three parts, (part that attaches to screen, resistance collar (tiny hexagonal shaped sleeve that provides the resistance to the hinge to hold the screen in desired position), and the holder that the pin slides into which itself then slides into the other part of the hinge (part attached to notebook)
I simply took some sandpaper and sanded on the pin of the hinge to loosen it up a little. Make sure to apply some grease or vasoline when reassembling.
IF YOU HAVE BOTH HINGES CRACKED SIMPLY DO THE ABOVE PROCEDURE TO EACH HINGE, ONE AT A TIME.
But that's the easy part of the problem. There is a metal bracket that attatches the hinge to the screen. This bracket is held on by three screws. The two that go through the hinge also attatch to the back plastic cover where the crack actually occurs. There are two 'nuts' embeded into the plastic cover. These anchor points were destroyed by the cracking of the hinge. Therefore the hinge cracks ARE NOT just cosmetic. If you disassemble the LCD front cover and open and close your screen you will notice these metal brackets will bend due to the resistance of the hinges. To repair this, I got some two part epoxy and used it to reattach the nuts to the case. This requires quite a bit of skill and patience. Anyone that built plastic models as a kid will have no problem.
I hope this elps some people fix this problem.