Hi thought some of you might be interested in this.
I had been plagued by this wake from sleep bug with my Ti 550 (512, OS
X.2.3) for months. I was also getting similar hangs while the computer was
awake which lately seemed to be associated with typing or touching the
computer. My machine was basically crippled (couldn't use sleep at all as
it would almost always hang going to sleep or waking up). Also had flaky
trackpad behaviour (esp. in the beginning). Lately the only way to
make the machine usable was to never use sleep and to frequently disconnect all
power (cable and battery) before booting up.
Anyway, I noticed this week that there was a particular spot on my machine
(left side of the space bar/cmd key area) that, when pressed, would trigger
a hang. When I investigated I found a small orange ribbon cable trapped
under the frame directly underneath this area that was getting abraded and
Long story short (so to speak), after I fixed it (pulled it out from under the
frame and placed some tape to insulate the damaged section), no more unstable
behaviour, no wake from sleep bug.
Apple has suggested the power management unit as being involved in this bug but
I'm wondering if people ought to be looking for current leaks or shorts to
explain the flaky behaviour of some G4 PBs.
Hope this helps,
Addendum: I have some illustrative pictures of the cable etc. but no way to
post them here. Hopefully Macintouch will print my message along with the
pics in the next few days.