Installing PowerBook G4 Aluminum 15" 1.67 GHz Hard Drive

Introduction
| Difficulty: | Moderate |
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I had 7mm screws here instead of 12mm. Did without them till later.
I have an Aluminum PowerBook G4 1.67Ghz since 2006.
3/4 (from bottom to top) of the LCD becomes either black or is jumbled each time I turn on the MAC or move the screen. I need to press the LCD at several locations in order for this problem to go.... any advice ?