IBook G4 no power

I have an iBook G4 (1.2 ghz) that will not power on. The battery shows all lights so it is charged and even when I take the battery out and plug in the adapter there is still no power. However, when the adapter is plugged in it does have the green ring lit up around it. I have taken it apart to check the power cable connection to the logic board and it was fine. I am leaning toward a logic board failure but the fact the adapter plug still lights up when plugged in is giving me hope. Any suggestions or tips would be greatly appreciated.
Thanks

If nothing happens when you power on (no start-up chime, Caps Lock key doesn't light when pressed, no light from Display) you should try resetting the PMU.
http://support.apple.com/kb/HT1431
This happened to my iBook G3, and a PMU reset fixed it. It is still working!
The Blue Screen is a different problem, and you should probably start a new topic.

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it will work but it is not advisable, ibook g3 requires a rating less amperage than the G4 and therefore comes with a 45w power supply (1.85 x 24.5 V) not 65W (2.65 x 24.5). Using the 65W the battery will wear out first and the logic board will be subjected to greater sress reducing life itself

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iBook g4 turn power on hear fans black screen battery charges but no keyboard or indicator lights? Help

Have you tried resetting the PMU?
http://support.apple.com/kb/HT1431?viewlocale=en_US

IBook Won't Power On

Hi Everyone,
I have a 12" 1.33 GHz iBook G4 (February 2006) that has been faithful to me for the past three years. The battery needs to be replaced (it holds a charge for about 10 minutes or less), but I've been avoiding the expense and have just been using it with the AC adapter.
I was using it last week when the adapter came disconnected from the wall. Usually, this would cause it to switch over to battery power and I have a few minutes to plug it back in before it goes to sleep. Last week, however, the entire computer powered down immediately (I wasn't met with the friendly sleep indicator).
I tested the battery on the iBook and it showed a full charge, but I can't get the thing to start up - not on the battery, and not on the AC adapter with or without the battery removed. Any tips on what I might try short of bringing it in to the Apple store? When I ran into problems with my old iBook G3 they used to try giving it a zap with a higher wattage PowerBook G4 adapter ... maybe that's what it needs :P
Thanks!
Matt

Usually, when a computer goes through a power outage
(and has no battery backup) the unit can be restored if
there was no surge or spike damages by resetting the
Power Management Unit.
When you have a good power adapter and battery, with
all other things being OK, this reset should fix the matter.
Other parts which could go bad include the DC-in board.
Resetting PowerBook and iBook Power Management Unit (PMU)
http://docs.info.apple.com/article.html?artnum=14449
Did you check to see if the original battery, or subsequent
if OEM replacement for the iBook, was subject to the recall?
Good luck & happy computing!

IBook doesn't power on

Hello I have an iBook G3 500 mhx ppc g3 256 mb or ram 15 Gb Hard drive Dual booting Mac OS X 10.1 and 10.3. I was going to upgrade the os but when I turned it on I heared the Hard drive turn on and then It turned off and nothing on the screen. I tried turning it on several times and used different power sources since the battery is shot. The problem is it won't turn on. No apple logo, or bong. No video. Please help!

Have you tried resetting the PMU?
http://support.apple.com/kb/HT1431?viewlocale=en_US
Although it may not help, it's the first thing an AppleCare representative would have you try.

Ibook G3 Strange Power Problem

Hi People
My Ibook has a strange power issue, it boots up when the battery is in. But as soon as you plug the power supply in it just switches off.
So basically it only works on the battery. The battery does charge though.
Any help is much appreciated.
Many thanks
Luke

Hi Luke and Welcome to Apple Discussions,
This is the procedure from the service manual for the Dual USB:
"The computer runs with battery, but not with the power adapter plugged into
wall outlet
1. Try known-good power outlet.
2. Try known-good power adapter and power cord.
3. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
Warning: Resetting the power manager will permanently remove a RAM disk, if
present, and all of its contents. You will also need to reset the date and time
(using the Date & Time control panel).
4. Replace the DC board.
5. Replace the logic board."
Richard

Ibook abruptly lost power and will not power on

I have a G4 Ibook. I have had it since Jan 06. I just got it back from having the optical drive replaced since it quit last April. All was working fine for just less than a day when it abruptly lost power and will not power on at all. The company did the repairs has trouble shot try to power it up and is arranging for us to ship it back. Any ideas of what it could be, and the likely hood it is related to the upgrade vs. a fluke occurrence that I will have to pay additional money to fix?
CG

It's hard to say for sure, but if the iBook powered up perfectly before the repair and didn't power up after the repair, you could argue that the upgrade caused the problem and it shouldn't be extra for them to fix it. I'm guessing, but the power input and the battery are in the vicinity of the drive, and it seems likely that something wasn't properly assembled or got damaged and that is what led to the failure. I wouldn't expect an independently occurring fluke.
Good luck!

My ibook loses battery power when turned off and unplugged

I have been puzzled by this since November 2006. I calibrated my battery twice as prescribed and still, as soon as i shut down my ibook and unplug it, it's battery charge goes down. Why is this? I'd greatly appreciate help. I'm a former pc user and none of my pc laptops have this problem. I just want to know why my battery loss power when unplugged and turned off. thanks in advance

Well you might want to try what they call "battery reconditioning" which is 7 simple steps listed below:
1: Charge your iPod fully.
2: Use it till you cant trun it on anymore!
3: Then carge your iPod fully again.
4: Then Use it till you cant trun it on anymore!
5: One more time charge your iPod fully.
6: And then again Use it till you cant trun it on anymore!
7: Then one last time charge it fully again.
Reminder: it is best to let the battery die all of the way each time inbetween chages. for example if it has 60% battery life dont charge it use it till it is dead and then charge it up all the way!
*This should inturn maximise your battey life also!*

Ibook left without power... loses its mind?

A friend of mine had a lengthy hospitalization and left her 14 inch Ibook unplugged the whole time. Once back (maybe 4 months) she powered in the Ibook with AC adapter and it shows up like a brand new unit. She appears to have "lost" everything on it. How can she regain her old profile and therefore her data?

The only thing you might have lost is the date/time and maybe some settings like mouse/trackpad since the iBook has no additional PRAM battery (as oppposed to PowerBooks) to sustain its memory during a long power break or an empty battery.

Dead ibook after replaced power supply

i'm trying to fix my mom's ibook for her. it hasn't powered up in a few years. apparently, she took it to a guy of questionable skills and he replaced the power supply. it then worked for a few weeks and died again. my question is this: could he have installed another bad power supply, or could something else in the computer be killing the power supplies? is there anything else i could try, like resetting it, to make it start up?
more details: the ibook has a brand new battery in it, and resetting the PMU has no effect on the machine.
Message was edited by: saridout

I don't know what you mean when you say that he installed a power supply?
The power supply of an iBook is an external power adapter which plugs into the adapter port on the side of the iBook.
So, what do you mean "he replaced the power supply"? Do you mean he replaced the power adapter? Or did he replace something inside the computer? If so, could you tell us exactly what he replaced?
What is the MHz rating on the iBook? Which type of optical drive does it have? Which version of the OS is installed on it? How much RAM is installed? Do you know the hard drive capacity and how much space remains available on it?

IBook G4 repeated power shutdowns

Hello!
I have an iBook G4 that I purchased in the spring of 2005. I have had increasing power/battery issues for one year now. Once last summer, my laptop went dead but the genius's at my local apple store taught me how to turn it back on and suggested I purchase a new power cord. I got a replacement power cord (not from apple directly) and my computer has had no problems for almost a year until last week.
My iBook has now started to go black and not want to turn on without my rebooting it after taking the battery out and replacing it almost daily and/or multiple times per day over the past week. I have to manually reset the time and date with each power failure. My battery power % appears to be fine always at 99-100% when plugged in. These power failures happen both if my power cord becomes even a milimeter loose from the laptop and while it is secured completely into the laptop.
My question is do I need another new power cord, another battery, or is my computer on its way out completely. Ideally, I'd love it to last 1 more year for school.
Also, I know I should get an external hard drive asap. Does anyone know if I get one now and back up my files from the iBook G4 and then later replace my laptop with a newer macbook will the external hard drive still work for my new model?
Thank you so much for your help and thoughts!

Battery Information:
Charge Information:
Charge remaining (mAh): 4680
Charging: No
Full charge capacity (mAh): 4684
Health Information:
Cycle count: 90
Condition: Good
Battery Installed: Yes
Amperage (mA): 0
Voltage (mV): 12561
The iBook is quite old and this is the second battery since I've owned it. The battery was a used battery purchased on eBay. For the first several weeks I used this battery the battery icon in the menu bar would never show (Charged) and would not last long. Eventually though it gradually increased in duration and now does show (Charges) when it is fully charged like it is now. But then, it started randomly shutting down as described above. When it shuts down it is like the battery is completely dead (even if it still has 90% charge). The LED indicators on the battery do not light. However, if I plug in the AC adapter the LED's work again and the machine will power up and run fine (except for the loss of date and time and other settings typical of removing the battery).

Does ibook draw full power from wall if no battery installed?

I've been using my iBook G3(duel usb) for over a year now without a battery installed(battery died last year). Was wondering if the ibook is now drawing electricity from the wall at 100% all the time now since there's no battery installed. Even when it's asleep or powered down. I heard that if you have a dead battery installed the ibook continually draws 100% power to try to charge it.
thx

If there is no battery in it, it won't be trying to charge it.
It's my opinion that you shouldn't use it without the battery in place. It draws 65 watts at the most (depending upon your adapter). Leaving out the battery subjects the internal contacts to dust and debris. Even a nearly dead battery will usually hold enough power to keep you from losing all your work if you accidentally become disconnected. If Apple intended for it to run without the battery installed, I believe they would have included a battery hatch cover.
I leave my iBook on 24/7 and just sleep the display so the automatic nightly OS X maintenance routines can run. The display takes the most power, and sleeping the display limits the power draw, even if it's trying to charge the battery. It's hard on the adapter to be working at charging a dead battery, though. If you put the battery in and the green ring lights up, you will know that the adapter is NOT trying to charge the battery. Your battery has been out so long that the adapter will probably not try to charge it, anyway. Check it and see. If the ring is green, you'll know it's not drawing a charge.

Ibook Would not Power up!!

Hello, usually I leave my Ibook running on sleep at all times but when I went to my girlfriends house I shut it down and plugged it into the charger so when I returned it would be charged up. Anyhow, when I went to power up I noticed that the entire computer was warm/hot with the exception of the battery. Beyond this weird phenomena my computer wouldn't start. After about a half hour in front of a fan it finally cooled off and started up. While I'm less concerned about the not starting up I am extremely concerned about why my computer over heated in the off position!? Any comments or help on this issue would be fantastic.

Hi Blake,
Welcome to the Discussions.
Chances are you closed your iBook before it was fully shut down. That can suspend the process and cause it to remain powered up but not functional. Be sure it's totally shut down before you close it.
John

IBook will not power on suddenly, weird noise from CD drive

Hello!
My iBook G4 (800 MHz, 512MB RAM) was working fine yesterday, then suddenly this morning it wouldn't power on. When I press the power button, I can hear the hard drive start spinning, but there is no chime and no screen. It just stays black.
The optical drive also makes a strange noise. Usually when you start it up, you can hear the CD drive make noise like it does when it ejects a CD. But now, it sounds very strange. If I had to guess, I would say that it sounds like it is going out.
I have tried to start without the battery and have reset the PRAM and PMU multiple times without any luck. Any thoughts would be appreciated.

gjortega ,
Here's the troublshooting guide from the service manual:
"Startup
The computer will not power on
1. Remove any connected peripherals.
2. Try known-good power outlet.
3. Try known-good power adapter and power cord.
4. Remove battery.
5. Reset the power manager by pressing the key combination Control-Option-Shiftpower.
Warning: Make sure you do not hold down the "fn" key when resetting the
power manager.
Warning: Resetting the power manager will permanently remove a RAM disk, if
present, and all of its contents. You will also need to reset the date and time
(using the Date & Time control panel).
6. Disconnect internal keyboard completely. Inspect connectors. Restart with keyboard
disconnected.
7. Remove any additional RAM and AirPort Extreme Card.
8. Try known-good DC board.
9. Verify power button is connected properly to logic board, if power button is not
functioning correctly or damaged, replace the top case.
10. Replace logic board."
Now that #10 would be about U28 or the GPU. U28 is that site I sent you. The GPU sits under the option-Apple key and you can put pressure on it from underneath that area. There is a large heat spreader that sits on top so you have to come from underneath.
Richard

IBook won't power on, but the fan is running top speed

hy,
just got back an iBook from the Apple Store and now it won't turn on..the screen stays black but the fan (at least it sounds like a fan) keeps running quite fast and loud.....any help would be greatly appreciated
neil

sad thing is the logic board was just replaced (within the last week)...not cool
oh well, thanks anyhow, at least we won't spend time waiting for it to power on

IBook G4 no power

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