PowerBook power on woes yet again!

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Macintosh PowerBook 1400 Series

Model PowerBook 1400 Series. Released October 1996

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LambdaCalculus @lambdacalculus

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发帖于: 2010年10月1日

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PowerBook power on woes yet again!

I just replaced the PRAM battery of a touchy PowerBook 1400cs/133, and finally see the green "power" light glowing. I decided to leave it charging overnight to let it get some power, and this morning tried powering it on. The PB doesn't seem to be responding still, and I hear no noise or anything of the sort.

All connections to the mobo are connected properly (VGA, speaker, trackpad, keyboard).

Resetting the PRAM battery doesn't seem to be making much of a difference. The green "power" light keeps glowing, even when the charger is disconnected or the battery is pulled from the PB.

Does anyone have any ideas what could be causing this power oddity? Resetting the PRAM battery via the switch in the back isn't making much of a difference. Should I declare the PB a vegetable or brain dead and send it to the junk pile, or is there a chance of bringing it back to life?

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My 1400 starts every time when I hit the small reset button on the back, the tiny button between the two inputs on the right.

由 Jamba 完成的 2022年11月9日

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mayer @mayer

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发帖于: 2010年10月1日

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Try resetting the PMU. Here's how to do it on your machine: http://support.apple.com/kb/HT1781

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I've tried that. It's not making a difference.

Perhaps there may be something else at hand here?

由 LambdaCalculus 完成的 2010年10月1日

It's been a decade since I worked on one. Try pulling the battery and starting from the AC only. Check the AC adapter with a voltmeter.

由 mayer 完成的 2010年10月1日

Pulling the battery didn't work, either. I'll have to go dig out my voltmeter. Hopefully if it's just a bad AC adapter, then that'll make the rest of the fix easy enough... I just get another one! :)

由 LambdaCalculus 完成的 2010年10月4日

Been a long time for me also. +

由 rj713 完成的 2010年10月4日

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My 1400 starts every time when I hit the small reset button on the back, the tiny button between the two inputs on the right. — Jamba
I've tried that. It's not making a difference.

Perhaps there may be something else at hand here? — LambdaCalculus
It's been a decade since I worked on one. Try pulling the battery and starting from the AC only. Check the AC adapter with a voltmeter. — mayer
Pulling the battery didn't work, either. I'll have to go dig out my voltmeter. Hopefully if it's just a bad AC adapter, then that'll make the rest of the fix easy enough... I just get another one! :) — LambdaCalculus

clydeskid @clydeskid 声誉积分: 1 · Answer 1 · 2011-02-18T21:53:23-07:00

clydeskid @clydeskid

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发帖于: 2011年2月18日

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Have you tried pulling the PRAM battery out and then starting up? This worked on my PowerBook G3 Pismo AND it worked with my PowerBook 3400. After the initial start up I can boot up without any issues, however I had to do this to both of them.

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Macintosh PowerBook 1400 Series

PowerBook power on woes yet again!

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