This repair is not easy. The hinges and screen bezel are held on with glue and new hinges do not exist anymore. You may be able to find a used one on ebay. attempting to repair it without a replacement hinge would be useless. Due to the extreme amount of leverage that will be placed on the broken hinge it would just pop right back out. In my opinion the effort vs reward would not pay off considering you can pickup a newer 15" powerbook for a few hundred dollars.