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Fix a G4 iBook 'instant sleep at start up' problem Laptop Macs
Okay. I spent waaayyy too much time looking for the answer to this problem, so I'm posting this for others in the same situation. I am the Resident Geek at a middle school, and one of our G4 iBooks (1.33GHz) would start up, then immediately go to sleep. If left for a day without power (battery removed and machine unplugged), you could log in before it went to sleep. In all of my searches, including a hint here from 2007, the reed switch seemed to be mentioned a lot...but there was also confusion on its location, and whether the logic board was to blame.

After taking apart the laptop and unplugging the reed switch -- which is located on top of the optical drive -- I confirmed that to be the problem. A new one for $15 (Google it!), and I was back in business. Hopefully this will help others.

Also, I will post the following as another hint, for others taking apart things such as laptops: the issue of leftover screws. The secret to a successful reassembly is the logic behind disassembly. I have found that a rough drawing of the different layers (bottom case, metal shield, etc) with two-faced tape over the drawing to stick the screws to their respective locations does the trick. I know that iFixit has detailed manuals, but given that their manual did not list the reed switch in the correct place, I was reluctant to rely on their screw placement.
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Fix a G4 iBook 'instant sleep at start up' problem
Authored by: acherion on May 14, '09 02:23:26AM

Just an aside with the screws issue.

I have a PowerBook G3 WallStreet that had some cosmetic issues with the trackpad and also needed a new PRAM battery. To replace either of these items, you basically have to pull apart the entire laptop, including removing the display.

Once I had ordered all the parts I needed, I got to work last weekend and the job wasn't as hard as iFixit said it would be (the difficulty level in the instructions was set at 'Difficult'). One thing that helped me a lot was screw management.

In Commonwealth countries (I'm from Australia) there is a popular product called Blu-Tack. It's basically a malleable putty that's usually used to stick posters on a wall or window. I had a stick of this stuff and each time I pulled some screws out of the laptop, I grabbed a blob of Blu-Tack, stuck it on a non-static-sensitive section of the part, and then stuck the screws into the Blu-Tack.

This made things very easy, especially with different length screws needing to go into specific screw holes. There's no piece of paper with diagrams or screws rolling off the table onto the floor etc – the screws stay with the removed part.

I've pulled apart a lot of things in my time, but had only thought of the Blu-Tack trick the weekend I did the laptop upgrade. I wish I had thought of it earlier!

I'm sure there is a suitable alternative to Blu-Tack if it's not available in the US or Canada, either way it saved me a lot of time – especially when I had a misaligned CD-ROM slot cover after I had put everything back together, which involved me pulling the whole laptop apart again. But I did all that within 10 minutes.

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