My 1.67GHz 15" Powerbook G4 has been getting a dimmer display and I've read that this is a typical symptom of an aging backlight. CCFL (Cold Cathode Fluorescent Lamp) type tubes are used for this and replacements cost around US$ 10-15 for laptops according to LCDparts. Finding information on how to replace it in a Powerbook seems pretty impossible. The few posts I've read on the subject seem to be mostly guesses or estimates. Very few hard facts and no pictures. Some people suggest that a completely new screen be bought (around US$ 200-300, or around US$1000 if bought directly from Apple) and replaced. There are a few DIY Powerbook screen replacement sites around. But since my LCD display works fine and doesn't even have a scratch I find this a complete waste of money. Unlike what I read about a lot of Mac users buying a new laptop every 2 years I can't afford that luxery (neither do I see the need for it -we're supposed to think about the environment as well, aren't we). Other posts indicate that the backlight is glued in some manner to the display and it's hard to remove/replace without damaging anything. Again, no photos or details, so I don't know if this is just an estimated guess or fact. I'd like to hear if someone knows more about the subject. Another thought that has come to mind: the current Macbook Pro machines have LED backlights, don't they? I know that the screen size is slightly different (1440x900 unlike the Powerbook G4's 1440x960), but maybe the backlight assembly could somehow be adapted for that display anyway?