After powering on, iBook G4 won't start up and fan goes crazy

I closed the lid of my iBook almost all of the way, but for some reason the display turned off. I'm not sure if it went to sleep or not; I can't remember if the front light flashed or not. I pressed the power button, but it wouldn't turn back on. I think I then held down the power button and it powered on, but the fan just started going at full speed and the computer never booted up. Since then, it refuses to boot; the fan just spins at full speed and the screen stays blank. I've tried resetting the PRAM and and PMU but it wouldn't work. Usually, the fan immediately starts going, but after resetting the PMU it takes a few seconds before the fan turns on. When I first press the power button, I can feel the hard drive "click" on. Once the CD drive did made those weird noises it's supposed to make, but the rest of the time it never does even that. It also never chimes. I'd really appreciate any help or suggestions. Thanks!

Welcome to Apple Discussions
The display is designed to automatically go into sleep mode when you shut the lid. That part is normal.
However, this part is not: it sounds like the wire connected to backlight on the lid is shorting out, preventing your machine from starting. The wire runs near the lid's hinge. Seems opening/closing the lid over time can cause the wire surface to degrade. Once the wire itself is exposed, the machine won't turn on if there is an electrical short.
If this is what has happened to your machine (sure seems like it from your description) you'll have to return the machine for repair.

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Hi Tigger_Rules!
See if anything HERE helps.
Specifically blank, grey screen.
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palkarate wrote:
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Some months ago (almost a year from now) my mac start to become hot after only a few minutes it started up and the fan goes crazy but I never realize why. I made some search on the internet but the only answer I found was using some software to reduce fan speed. It didn't work. I run the Hardware test but nothing strange. I also took my macbook to an apple certified repair center but they told me that nothing was wrong. I also ask to another repair center but same thing. So I left my macbook as it was with this super fan noise all the time. A quite disturbing thing but there was no solution and for what I'm doing my machine is ok so why change it? (It was the only solution they gave me)
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HI R C-R.
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PIDProcess Name % CPU Threads Real Mem Kind Sudden Term.
## Firefox 2,1 15 106,3 MB Intel
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IBook G4 won't start up after installing Airport Extreme card

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Sven, Welcome to the discussion area!
Are you certain that you have an AirPort Extreme card?
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HELP.
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Am I a goner?
I saw that some other people had problems, but it seems like everybody's is just slightly different. My display looks totally normal, just won't get past the blue screen. My disk utility said that it didn't need any repairs? Looks like most other people at least saw some errors in there...

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I'm having a frustrating problem with my G3 iBook - as with many other posters, it won't start-up at all. I have tried the shift-ctrl-option-power sequence, without any luck.
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Yes, the logic board problem had occurred to me, too. If you pick it up in your left hand and squeeze the case to the left of the trackpad, and that allows you to start up, that is indicative of a failed logic board.
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John Sawyer
CJS Macintosh Repair
Instructions for removing the lower case:
iFixit.com
Good luck.

After powering on, iBook G4 won't start up and fan goes crazy

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