Here's a link with great pictures of someone who had the same broken screen problem you have. http://www.david-reitter.com/software/PowerBook-repair/index.html
The first thing to do would be to reseat your cables and review carefully the installation instructions you can find here: http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Display/352/1
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Are you sure the display was good? Where did it come from?
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Are you sure thenew display was good? Where did it come from?
Here's a link with great pictures of someone who had the same broken screen problem you have. http://www.david-reitter.com/software/PowerBook-repair/index.html
The first thing to do would be to reseat your cables and review carefully the installation instructions you can find here: http://www.ifixit.com/Guide/Repair/Installing-PowerBook-G4-Aluminum-15-Inch-1-5-1-67-GHz-Display/352/1
Are you sure the display was good? Where did it come from?