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Model A1001 or A1025 / 667, 800, 867, or 1.0 GHz G4 processor

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Excessive Fan noise after being on for a while?

I wanted to know if this is a known issue and what I can do about it. The fan is really working overtime and it is hard to work when hearing that noise. Also, I don't want this thing to catch on fire if it is possible for that to happen.

It is a Powerbook 867 titanium model. thanks!

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is there a guide on how to replace the thermal paste on this powerbook?

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My bet would be that the vents are clogged and the thermal paste needs replacing on a machine of this age. I would tear it down, clean the vents and replace the thermal paste. Here's how to get to the heat sink: PowerBook G4 Titanium DVI Logic Board Replacement

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When you open it up you will find apple in the titanium laptops have used the worlds smallest internal cooling fan (1cm x 1cm of actual fan blade airflow area). Also pointing in a wierd relation to the vent it sits next to , the thermal design on this laptop could not have been much worse from a design perspective, except say a bare chip ? I have replaced the thermal paste on mine neatly and precisely with top quality thermal paste it makes very little difference, as the poverty of design revolves around an inability to push the hot air out of the laptop, again another example of form over function, this laptops micro fan will kick in hard with no heavy load straight after boot up. The only way to correct excessive fan noise on the titanium models would be to completely re-design them. They are flawed by design.

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Yuri será eternamente grato(a).
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