There is a software hack that bypasses the firmware Apple put in place. Apple didn't want the iBooks competing with the Powerbooks. Do this at your own risk. Go to;
Models Supported - Is your model is supported
http://www.rutemoeller.com/mp/ibook/supportlist_e.htmlDownload
Latest Screen Spanning Doctor
Go to:
http://macparts.de/ibookAnd follow the instructions
Just follow the mac brick road. And good luck :-)