I love my Apple laptops, but my g3 900 iBook, my girlfriend's g4 800 iBook and my 2 day old 1.67 g4 Powerbook have this same problem. It happens to me all the time, but my girlfriend doesn't have it happen to her often (almost never), which leads me to believe it is something in particular that I do. The only real difference between our usage is that I'm a major user of X11, and while she uses it as well, not as much. The problem is this - if I leave the computer to do some task (like compile a big project, make a large file transfer, etc) and let it turn off the screen on its own, then sometimes (like 10% of the time I'd say) when I come back to use the computer, the screen won't turn back on. I can ssh in and all is fine on the machine, everything is running as it should be, and there is no crash, but the backlight stays off. I can even see what's on the screen if I shine a light on to it. I've seen this problem reported on the Apple forums - seems common enough that it should be a big issue - especially since I can trigger it on every apple I touch. Is there a solution? I don't think it is a failing backlight, just because it is so tightly related to how the computer is being used, and it has happened with every version of OS X since 10.2 (using 10.3.8 right now). It is driving me insane because I end up having to reboot the computer to get the screen back on. Brightness controls do nothing to help, and if I close the lid, the computer will not fall asleep. Any ideas? Its making me crazy!