PowerBook G4 Keeps falling asleep!

After doing some research I discovered this problem was being cause by the on-board sensors. I opened up my powerbook and remove the heat sensor under the track pad and both the right and left optical sensors. The heat sensor removal requires someone with a steddy hand and micro tip soldering iron. The optical sensors are removed with a phillips screw driver. Hope this info helps:)

Hello
I had the same problem. I turned out to be the Keyboard Key Lighting brightness control.
This control is located approx on a line below the Number keys and above the QWERTY Keys to the left of the {tab} key.  I had to get a bright light (flashlight?) to shine on the speaker area approx. on the line described above the restart the computer.  It ran normally untill the light was removed, or until My Hand passed over the area, or someone else pointed to my screen and broke the light's path.  You may be lucky if you start the computer with a light and are careful you may be able to cancel the beyboard brightness control in the System Prefs.
Ultimately I found that the problem was started by a power connection that was bent by use.
I did not fix it, only minimized the distress to the user.

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