Hello, if you are reading this thread, odds are, you have a Titanium PowerBook G4. First off, if your Mac was made before Sept. of 03, your Macintosh PowerBook is, infact, a Titanium PowerBook. Anything after is an Aluminum PowerBook. Eventually, this guide/manual will be put on either Gavin or I's website. Backlight Issues: Symptoms: Flickering Backlight No Backlight. Backlight turns on briefly then goes off. Causes: Bad Inverter Board ($6 USD) Bad Backlight (new LCD required) Bad Backlight Cable. Solution: First, buy a new inverter board, cheap fix, and install it. If you still have issues, check the wire running from the inverter to the screen. If everything is in order, your bulbs might be bad. A new screen is required. Hard drive won't appear or is erratic: More than likely, its the hard drive cable running from the drive to the motherboard. Speaker (left or right) isn't working. (Coming soon). Lid won't shut: More than likely, the release button has worn out, replacing it is rather easy.