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A fix for a Powerbook intermittently waking when closed System
I noticed that my 12" AL Powerbook started to not go to sleep when shut or would "randomly" wakeup while still shut -- leading me to be in situations when the battery was all-but-drained at inopportune moments.

I discovered the problem was physical: the top had become just a tiny bit bent, causing the corners not to come flush when closed and (presumably) causing the sensor to think that it had been opened when it was bumped a bit. Closing it on an object (e.g. a pencil trapped near the trackpad button) and pushing the corners gently down to bend it back flat seems to have fixed the problem.
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A fix for a Powerbook intermittently waking when closed | 2 comments | Create New Account
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A fix for a Powerbook intermittently waking when closed
Authored by: TC_ on Oct 31, '03 12:22:54PM

When iBooks or PowerBooks have these problems, one of the following is usually to blame:

1. When the lid is closed, it's pressing against the keyboard, causing the computer to wake up.

2. The "reed switch" is broken. Depending on the model, the computer either has a magnet in the lid and a magnet-detecting switch in the base, or vice versa. If the magnet becomes demagnetized, the switch will cease to work completely. In other instances, the switch itself breaks or becomes erratic, producing erratic behavior.

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A fix for a Powerbook intermittently waking when closed
Authored by: woodstea on Apr 21, '04 02:00:32AM

I can confirm that the original hint is valid - I had the same thing happen with my 12" Al, ostensibly after a fall to the floor. I had the intermittent on while cover closed problem, and also the latch seemed looser than before - when closed there was some give in it.

After reading the hint I tried the pencil trick - both on the front and right edges, and now the cover closes as before, with the latch reasonably tight and the rubber front corner pads flush against the wrist rests. So far I haven't seen the screen on while closed problem either.

Obviously you want to do this as carefully as possible...

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