Hi! I could really use some help solving a problem I'm having with an iBook G4 (1.33 GHz) that I'm trying to fix for a friend. I fixed the two original problems but a new (much worse) problem has developed and I'm stumped as to what the cause might be. I've searched around and haven't found anyone reporting quite these symptoms (except possibly one post here about two years ago, with no resolution), but I hope maybe someone can either recognize the problem or perhaps offer some educated guesses that might be of help. What's happening now is that the computer seems to boot up (into OS X 10.4) normally, but after less a minute it just goes to sleep. Always. Plugged in and with or without the battery present. It's only after completing the boot sequence though. If I hold down Option to get the boot selection screen, the computer will sit there forever just fine. If I wake it from this state (by pressing a key), the screen comes on, but then the backlight goes out almost immediately. (It does come on briefly, and I can see that the screen is still displaying the desktop by shining a light on it.) However, the keyboard and trackpad are non-functional. The computer is not frozen -- pressing the power button pops up the Restart/Sleep/Shut Down dialog, but I can't do anything more. Then, after 30 seconds it goes to sleep again. Actually, 32 seconds from when I hit a key. Every time. I cannot figure out what kind of hardware failure could cause such a problem, besides possibly the PMU, but I've tried reseting it several times. I've tried booting from another (working) iBook G4, set up in Firewire target mode, and the exact same thing happens. (It also won't boot from the OS X install disc, but neither will the other iBook, so maybe the disc is bad, though I used it with my Cube not long ago.) Some further background: When I was given this computer, the symptoms were a flaky hard drive (not spinning up or not staying spun up) and extremely weak wireless. The hard drive actually works perfectly in an external case (at least, it never failed for me), and the wireless works with the new antenna. But I'm concerned that maybe I caused some damage when I was doing the antenna replacement (which is joined in an assembly with the inverter cable), as that's when the current symptoms started. Everything seems to be working for that first 60 seconds, though, and the timing is so regular -- what could cause that behavior? If anyone has seen this, or has some suggestions as to what might be at work and (ideally) how to fix it, I would be very grateful.