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Apple's line of PowerBook laptops was intended for the professional and power users. The PowerBook line includes the PowerBook 100, Duo, 500, and 5300 Series; the PowerBook 1400, 2400, 3400; the PowerBook G3, G4 Titanium, and G4 Aluminum.

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system sleeps randomly, and system log shows the following message

system sleeps randomly, and system log shows the following message,

"powermanagement emergency overtemp signal. going to sleep"

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I'd reset the PMU and PRAM to see if that makes any difference. I'm sure you've looked at your sleep settings, but if not, I'd take a look there and see if the machine is falling asleep when it's set to, or at a different time.

It doesn't seem there's a definitive answer to the problem, but here's an interesting thread on the issue:

http://archive.macfixitforums.com/ubbthr...

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Since it mentions overtemp I'm including a recent ifixit discussion on that. + for research. Ralph

How can I verify if the cooling fan works?

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