Q: IBook G4 Will not turn on.
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Aug 31, 2016 9:02 PMby Kenichi Watanabe,With the original RAM installed, try using the procedure to Reset the PMU
Resetting PowerBook and iBook Power Management Unit (PMU) - Apple Support
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Sep 1, 2016 12:26 AMby Kenichi Watanabe,The reset PMU procedure varies based on specific model, so if you did not look at the linked document because you "already tried" previously, confirm you used the correct procedure for your iBook model.
Does the main battery hold a charge? On my older PowerBook, it will not power up at all when BOTH the main battery and backup battery (which holds the current state when swapping main battery) are dead, even when connected to its power adapter. Currently, the backup battery is still dead (actually internally disconnected), but my PowerBook starts up and works fine because it has a working main battery that holds a good charge.
Are you saying that you get no response at all when pressing the power button. If you get initial power (and the startup sound), but the iBook does not start up, you can try resetting PRAM ("NVRAM")
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Sep 1, 2016 12:40 AMby TheEnder ,Yes the battery has 4 green lights on it. It was fully charged before it "Died". i get no responce at all. No fans to CD Drive at all. the battery has 4 green lights on it. and when i connect to the charger, It turns green and it wont start at all. nothing! ive reset the NVRAM PRAM EVERYTHING!
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Sep 1, 2016 12:52 AMby Kenichi Watanabe,When my original PowerBook battery died, it was sudden, like the battery exceeded a pre-set usage (or charge cycle) safety limit. Since my PowerBook's small backup battery was also dead (which I did not know at the time), my PowerBook would not power up at all, until I replaced the main battery.
Can putting DDR2 RAM Into DDR Socket KILL My Computer?
I suppose it's possible, if the RAM module is defective and caused a short-circuit. Normally, incompatible RAM would not work, but not cause damage.
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Sep 1, 2016 1:05 AMby TheEnder ,But the ram wasn't defective. It came from a fully working IMac for the 2006 era. When i put the ram in and turned it on, the computer would turn on but nothing would display on the screen. the backlight of the screen lit it up so you could still see the light up apple logo on the back of it. So i took the ram out and now it wont turn on at all.
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Sep 1, 2016 1:18 AMby Kenichi Watanabe,That's what I'm saying... My PowerBook worked fine (with a dead backup battery) as long as the main battery was working. But with both dead, it would not power up at all (when the main battery died), until I replace the main battery. I never replaced the backup battery, since I didn't have a need to swap the main battery "on the fly" (and it's usually plugged in to power at this point).
