Logic Board Problem on 1.2Ghz G4 iBook?

My G4 iBook (14inch, 1.2 Ghz) has been giving me problems in the last two weeks.
At first I thought it had something to do with the latest update to OS X 10.4.11, but after doing an archive and install and checking things out with Disk Warrior, I'm thinking it's the logic board.
The main problem is that the machine has a tendency to freeze while I'm working with it. Sometimes it happens when I'm just doing work with Word or Appleworks. Sometimes it happens when I'm trying to access an electronic gradebook where I teach. It DEFINITELY freezes when I attempt to pick up the machine from the lower left corner where the hard drive is located.
I thought it might be a hard drive issue, so I actually replaced it, but the problem of freezing remains.
The freezing is weird, however. What happens is that the cursor can move around on the screen, but that's all that works. I can't access any menus or anything on the dock. At times the dock will freeze in middle of enlarging as the cursor passes over it.
After doing some research, it seems that this might be a logic board issue.
My machine isn't under warranty since I bought it secondhand off eBay and I've been using it quite a bit for the last year with no problems whatsoever. Is there a fix to this or am I going to have to replace the logic board? I'm seeing prices that are running in the $350 - $500 range.

Actually, there are a couple of things you can do that cost a lot less than a new logic board.
First of all, run the Apple Hardware Test to verify that all of your chips are OK. They probably are.
What is probably wrong is that the ball grid arrays that holds the chips to the logic board have started to fail. This will cause freezing, particularly as the board heats up.
The cheapest thing to do is to make and install some home made shims which press on the chips and enable them to make better contact with the logic board. Here is a site which shows how to do this:
ibookG4 logic board fix:
http://www.coreyarnold.org/ibook/
However, there is also a more permanent solution, which is to send the logic board to a specialist to be reballed. I did this recently, and I can highly recommend the following specialist:
http://www.superiorreball.com/
The cost to reball my iBook logic board was just $75.
You will have to remove the logic board and send it off, but since you already replaced the hard drive, you probably are already familiar with the ifixit site.
Good luck!

Similar Messages

IBook G4 (Jun 2005 model) Logic Board Problem (No Display and HDD noise)

Hello All
I have been using my iBook G4 (1.2 GHz) with no problems since I purchased it in June 05. But over the past 2 days, I have been noticing this weird incident of "no display" when booted and I was hearing a loud fan noise at times and I can hear my HDD spinning etc. When I tried to restart pressing CTRL+OPTION and POWER after shutting it down, it booted up but reverted my PMU to a date in 2001 (resetting all my email, music etc). But when I tried shutting it down again and restarted normally, I heard the bootup chime but no display. Again, I could hear the fan and the HDD spinning.
I took my laptop to the Apple Store here in Boca, FL today and was told that its a logic board problem.
I know there was a Logic Board Repair Initiative from Apple for the G3's and early G4's. Does anyone know such a thing for the fairly recent iBook G4's??.
Any help is immensely appreciated.
Thanks
Karthik
[email protected]
[email protected]
iBook G4 Mac OS X (10.4.8)

How do I verify that my issue is a logic board issue. Recently, computer froze. Tried a hard reboot but no luck. It either shows a blank blue screen or I'll get the grey screen and apple with the start-up spinner but it'll stop spinning.
That's it. I'm able to browse the contents of the iBook's harddrive when I connect it to my Ti Powerbook via Target Disk mode. I even lauched Disk Utility from the powerbook and verified the iBook's drive and it found no problems.
Could it be the same logic board issues that you guys are having? How do I verify this? Is it worth paying to repair an 800mhz G4 iBook (applecare expired April '06)?
I've heard about kernal panic issues with the macbooks so I'm apprehensive about getting one of those right now too. Getting frustrated. Actually considered copping an inexpensive PC laptop... ugghhh.

DC In Board or Logic Board problem?

I have a 12" iBook G4 that's about 2 years old. It's been having intermittent problems reading the charger for awhile now and would flash charging and then not charging over and over again before it would begin to charge up again. This weekend it decided to stop reading the charger completely. The battery works fine in another computer and another battery works fine in it -- it just won't charge again once it loses it's juice.
It also will not work with just the power adapter plugged in with no battery. The little light comes on, but doesn't seem to pump power into the computer. And it's not an issue with the charger as it charges our other iBook just fine.
I've read conflicting info elsewhere about what it actually could be so I'm hoping someone could shed some light. Does it sound like just a DC In Board problem? Or a bigger Logic Board problem? Any help would be great... thanks!

From what I have read on this forum, people have managed to get the DC In Board replaced for a little over US $100. This would be at an Apple authorized repair shop rather than by Apple itself. This is much less than the cost of a new MacBook. I don't know what might be available in your area, but it would be worth asking at a repair shop.
Good luck!

How can I differentiate logic board problem from display problem?

I have been given an iBook G3 900MHz (one of the models known to have logic board issues.) When I boot it up, I get the Apple chime, the hard drive spins, and the caps lock and num lock lights light up. Sometimes the display comes on, sometimes it does not. When it does, it flickers and goes off and on. I don't get lines or pixels or anything that I have seen described as being indicative of logic board failure. As far as I can tell, the computer works fine otherwise.
So, how can I be sure the problem is logic board-related and not an issue with the inverter board or the display cable?
I was also wondering, how much trouble - if any - is Apple giving people about replacing logic boards on certain models of iBook? This one should be eligible, as its serial number falls in the right range and it was bought in Oct. '03, which was within the past three years.
Thanks!

there was a period when the display showed colored lines and pixels
Classic logic board symptoms.
The iBook freezes a lot
Mine did, too, with the logic board problem.
my gut tells me the problem is logic board-related.
My gut tells me your gut is probably right.
My question about repair coverage is this: According to Apple's support site, where I entered the serial number, this computer's "estimated purchase date" was October 3, 2003. But the owner no longer has any actual proof of purchase; no receipt, no packing slip, nothing. Is that needed to have Apple replace the logic board?
No. As I said, I bought mine, used, on eBay. I called in when I recognized the logic board symptoms (I had been working these boards for over a year at that point), they sent a box. It went out on Wednesday. They got it, fixed it, and shipped it back to me on Thursday, and it was back in my hands on Friday. (Practice makes perfect, I guess.)
Also, does Apple make their determination of age from when the computer was purchased or when it was built?
Purchase date only.
Or does that decision depend on if a person can produce a receipt or not?
Nope. The only paperwork I sent in with mine was the slip Apple sent in the box to indicate what all I was sending them (adapter, battery, extra RAM). What good would an eBay seller's receipt have done?
I probably have to go to my local service center (in NY that's a place called Tekserve, which is a great place to get a computer fixed, but the wait to be seen averages over an hour!)
Don't mess around with Tekserve. Call Apple at the number listed on the FAQ page:
http://www.apple.com/support/ibook/faq/
Thanks again for your input. I appreciate it.

Continual logic board problems?

I just had my third logic board replaced (on my ibook G3 dual usb) this week. It goes out every 13-14 months, like clock work. 2 (including the most recent) out of the 3 times apple has replaced it without fuss or charge. When I received the computer this last time, it booted up fine all of my data and programs were there, except the clock was set to 1969. I had backed everything up on an external hard drive, so I decided to do a clean install of tiger. Tiger installed and booted then I shut it down for the night. This a.m. the computer would not turn on. I tried removing the battery, leaving the battery in, unplugging from the power supply, standing on my head etc. nothing, no apple tone, no light, although the keyboard light is on. Question, what happened? I have not tried resetting the PMU but I am not sure that it will work b/c I cannot even get my computer to turn on....Any thoughts before I send it back to the depot.
also, about the logic board replacement program....is the 3 year time frame a moving window? for example, i bought my ibook in 9-02 but my last logic board was replaced 2-06 is the 3 year time point at 9-05 or 2-09?
any thoughts are greatly appreciated.
Beckley
ibook G3, dual 1.8 G5 Mac OS X (10.4.4)

Your logic borard problem isn't the screen one then? I ask as I have exactly this machine (same RAM too!) and it has developed what sounds like an identical problem. It had its video fault logic board replaced 2 years ago but has been perfect since. Been used daily without a hitch. Then it just shut down without warning.
Now, if you leave it a while (hrs) it boots. You can then run it for a while, typically 10-20 mins (long enough to drop a back up of all the data over a wireless network which all worked fine). The it just suddently and without warning goes to instant death. And will not power up again. Pressing pwoer key or trying the PMU reset produces no response at all. Battery is ahcrged and charging system works when it is running fine.
This suggests a logic board problem but not the video one the free warranty covers. But you are saying yours has had this shut down problem repeatedly?
It has the feeling of being a risk to invest in logic board replacement.

Logic Board Problem?

Hey Everyone:
I'm still a fairly new Apple user, coming from a world of DIY computer problems. Problem is, this nice compact ibook of mine prevents me from being able to do much on my own. I'm trying to solicit some advice as to what I can do about my current hardware issues.
About 5 months after having my ibook I noticed white spots on my screen. I knew it would be repaired by Apple, but being the cheap SOB that I am I decided to put it off until the end of my 1 year warranty. I figured I could get everything fixed then, and avoid paying for the extended warranty. Well, I followed through with my plan, but I've noticed some new problems. I'm not too happy about this, but at least I realized these problems in time to extend the warranty.
The Problems:
-The first night I got it back, the computer completely froze! Everything working fine, and BAM! The screen looked fine but the entire system was locked up. Fortunately, this only happened twice that night, and I haven't seen it again.
-Also that first night, the computer would not come out of sleep. It sounded like the hard drive would start spinning, and the flashing light would turn off, but the screen was completely blank. I would be forced to hard reboot, and then things worked better. This led me to a reinstall, but the problem still comes back every so often.
-One day, I logged in to find that my clock had been reset to 12:00 and somewhere around 1960(?). I set the clock to the appropriate time, and have since realized this could be a PMU issue. I just reset the PMU a few minutes ago, and I'm keeping my fingers crossed this could solve the problems.
-A couple of weeks ago, the computer would give the dreaded 3 beeps at startup. This seems to imply that OS X can't find the memory bus, but again this seemed to disappear as well.
I'm looking for some help here. I'm afraid that the Genius bar will just ignore me, because I still can't find a way to reproduce my problems on a regular basis. Yet, the instability is driving me nutty, and I rely on my laptop to get almost all of my work done. Overall, I'm not very pleased with Apple's hardware work. Instead of replacing the entire screen casing, they only replaced the screen itself. That seems like a lot of work with a lot of potential to mess things up on my computer. What's with that farce of a bill that Apple used to convince me to renew my warranty saying that the screen cost $400? No way a screen costs that much, maybe the entire unit. Also, I lift up my keyboard and notice the Technician lost one of the screws. What kind of professional work is that, I ask you?
Does anybody have any advice on how I can get help with these problems? I just want to get through these rough times while minimizing my inconveniences, and avoiding the potential loss of any data. I am making regular backups, I just don't like the idea that my laptop can die on me at any given time without any warning.
Thanks!!!

maciscool,
That's a good guess, but maybe I wasn't clear enough. The only hardware changes are what Apple did when they replaced the screen. If the RAM is faulty, then it is something they damaged, because everything worked fine before I handed my ibook over to the Genius Bar. I ran memtest, and the Apple Diagnostics CD a few times, and I don't get any errors.
I'm more curious as to how people knew they had Logic Board Problems, and how did they prove this to Apple. As I see it, a problem such as this would either be disastrous or unpredictabe, that latter being much harder to prove to the retailer.

Can I use a 16VRAM logic board in my failed 8VRAM G3 ibook 600mhz?

Hi, my logic board has failed in my G3 ibook 600mhz, I have just managed to find a replacement board for it which has a 16VRAM in it. I have checked the box on my ibook & it says it is 8VRAM. Will the logiv board still be ok to fit/work etc?

That post is rather misleading.
The 8 MB logic boards probably fail less often than the 32 MB ones, from what I've seen here.
The 16 MB logic board failures may not be seen quite as often because there were comparatively few of them produced. Apple produced many more 8 MB and 32 MB iBooks than 16 MB ones, so it stands to reason that we would not see as many reports here of 16 MB logic board failures as we do failures in the other models.
The poster in the post cited did not say he actually installed the logic board he purchased, although that is certainly the assumption one would tend to make from the statement.

RAM upgrade MBP 7.1 fail. Only stock RAM works. Logic board problem?

pulling my hair out here.
I have recently uprgraded my mid 2010 mbp to mountain lion and thought i would upgrade as much as i could but ran straight into frustration town.
after a full day trying 8 different types and amounts of RAM, my MBP will only boot to a useable state with the stock ram it came with.
I made an appointment with a 'genius' at the apple store (the annoyance of having to call a condescending punk a genius is just too much to handle) and had said 'genius' disappear with my mbp for a half hour or so. Once he returns he tells me it is logic board problem and 'boy you aren't going to like the price of the repair'. F'n' right, genius!
My question is this:
would a faulty logic board allow the stock ram to work but NOTHING else?
secondary question: anyone else notice a slowing down of operations with mountain lion?

In your original post I got the impression that your MBP worked with the original RAM. Apparently that was a misconception on my part. My suggestions are to first run an Apple Hardware Test and see what clues, if any it offers:
http://support.apple.com/kb/HT1509
You may have to start it by holding OPTION D.
Next I suggest that you look over this user tip document and follow the procedures that apply to your MBP and OS:
https://discussions.apple.com/docs/DOC-3353
Kappy may have some additional ideas.
Ciao.

Repeated logic board problems

Hi,
I purchased a new ibookG4 in August and it has experienced logic board failures twice since then. In October it started having kernel panics and randomly shutting down so I sent it in to Apple and they kept it for a month! I've had it back now since Nov and yesterday it starting having the exact same random kernel panics. I took it to the apple store and they shipped it out again. I've tried my best to be patient but Apple (the genuises, customer relations) are very dismissive of my concerns that I have recieved a lemon. They act as though it is perfectly normal for a customer to be without her brand new computer for months at a time.
Sorry for the rant but does anyone have any advice on how to handle this kind of situation? I've had Macs all of my life and this is the first time one has ever had a problem.
Thanks
Christine
Ibook G4 Mac OS X (10.4.3)
powerbook 15 1.25ghz Mac OS X (10.2.x)

You should call the AppleCare Support number, but ask to be connected to Apple Customer Relations. Be friendly and firm with them. Be well prepared with all the dates and case numbers for all the service your iBook has had. Let them know you're having trouble again and you're about to call AppleCare Support or take your iBook in to the store. Have a specific request for Apple Customer Relations, for example, let them know that if you have trouble again after this repair, you'll expect a replacement. There's no guarantee they'll agree to this, but at least your trouble has been recorded by them. If you do have trouble again, you'll be able to refer to this conversation and your expectations.
-Doug

2 logic board replacements and a very hot ibook!

i just got my ibook back after apple replacing the logic board for the second time in 6 months. i barely squeaked in under the program, so i didn't have to pay for it, but if it happens again, i am out of luck.
i am hoping someone can tell me whether there are precautions, etc that i can take in order to prevent this from happening again? i really am not even sure what causes the logic board to fail, however the two things i have noticed about my ibook are that;
a. it gets extremely hot on the bottom (something i have found that a lot of ibook g3 users experience) but i'm not sure what to do to make that less of an issue. i try to make sure there is adequate airflow underneath and the fan does indeed work, but it still seems to run a lot hotter in general than it used to and the fan comes on quite a bit.
b. my battery isn't holding much of a charge anymore. it's the original battery(so it's about 3+ years old) and i realize i need a new one, but things have been a bit tight financially so i have been putting it off. i have mostly been using the computer while plugged in, but when i do use it on whatever charge the battery will hold, i always let it run until the battery is drained.
could either of these issues be part of my logic board woes? i have also heard some things about not having enough ram so the computer runs too hot. furthermore i have heard that the ibook running so hot could be a sign that my hd is going to die. any truth to that? can i prevent it?
anyways, i am really hoping someone can please help me figure this out before the logic board goes out again or worse!
thanks so much,
jess
ibook 900 MHz PowerPC G3 Mac OS X (10.4.8) 384MB SDRAM

Hi, Jess. Welcome to Apple Discussions.
The best suggestion I can give you to keep the logic board from going out again is to never pick the iBook up by its left front corner alone. If you pick it up in your left hand, as I often do mine, pick it up in the center, under the trackpad. Better yet, especially since it seems to be running hot, get yourself a laptop desk like mine, and pick it up, desk and all. I have this model, and I leave it folded in half. There is a metal rod that fits in slots and elevates the iBook to keep it cooler. My son bought mine for me for Mother's Day, and I thought I wouldn't use it, but I use it ALL the time, and I pick it and the iBook up together, so the case of my iBook never flexes (which is rumored to be the cause of the logic board failure).
Don't use the iBook while it is sitting on a soft surface like your lap, a sofa, or a pillow. Keep it on a firm surface, and make sure all four of the rubber feet on the bottom of it are intact. They allow for better ventilation, and let it run cooler.
You do not need to run the battery until it is drained. That used to be the advice with old nickel-cadmium batteries, which developed a "memory" if you didn't discharge them completely. The newer lithium-ion batteries in the iBook do not have that problem.
The typical lifespan of a lithium-ion battery is two to three years, no matter how well you care for it, so it's had a pretty good run.
You can read more about Apple's recommendations on how to best extend battery life and lifespan at this link:
http://www.apple.com/batteries/notebooks.html
You can keep your iBook running a bit cooler and save some wear and tear on your hard drive if you maximize your RAM with a 512 MB RAM module. You can find the best prices at <a href=http://ramseeker.com/scripts/sortModelDetails.php?modelId=1&sortSize=512mbramseeker.com
Douglas McLauglin, who buys RAM for the Macs where he works as well as his own personal computers says:
I have purchased RAM from 1-800-4-MEMORY and Crucial for myself at home. And we've ordered RAM from Data Memory Systems at work. They're all reputable dealers.
Be certain that whatever vendor you choose provides a lifetime warranty. It doesn't happen often, but RAM can fail.
Instructions for installing it yourself can be found in this Apple Knowledge Base article:
http://docs.info.apple.com/article.html?artnum=111918
Once a portable computer is past three years old, it's a good idea to start saving for a new one. Technology moves so fast these days that you almost need to upgrade that often to keep up.
Good luck!

Is this the dreaded logic board problem?

Hello all
My iBook G4 has recently started having trouble. It will often go into a dark screen, where the caps lock light will go on and off but I can get no other response (though I can hold the power switch to force it to turn off). Often when turning it on, the fan comes on and the caps lock light responds, but I get no further - once in every few tries the laptop turns on.
When using the laptop, every once in a while it will suddenly flash vertical lines on the screen and go into that "half-off" mode; last night when left on for a time there was a loud crackling noise coming from the computer - I turned it off by removing the battery.
Am I looking at spending a day doing the famous shim job, or does this sound like a different problem?

Max,
Well, I was wrong on that one. Even I'm amazed how many people, using computers with different logic boards, are still having this problem. Though I have little sympathy for corporations parsing liability and responsibility, Apple's a small company to have such a potential recall. Want to do them a favor and fix it youself ?
Check my last post on Ollie.g's thread, below yours, titled 'total lockup... tried/answered previous suggestions'. If you can solder microjoints, examine all & do so; if not, use my post. You might be the first to try compressive heat sinks. I like the first, the second is for perfectionists aiming at specific pins, and the third is...well, experimental (and will likely need some expanding grease on the chip side, and expanding pads toward the cover).
My G3 iBook, which suffered this, booted only in single user mode. My damage was innocent, I believe--a system file written that was corrupted by a spark, or whose block was corrupted by a spark. If you can fix it using 'Disk Utility' from a DVD, it's the first. If not, it's the second and needs to be reinitialized (blocks marked bad again). The smiling face is new ( ! ) and must mean it found Mac OS 9: the question mark likely means it didn't find Mac OS X bootable.
Only Mac OS X is damaged, not your home folder. Copy or backup everything of value immediately using Mac OS 9. The iPod is the perfect backup medium, but your most precious items will likely fit onto CDs. Then there's the internet: Apple will sell you 2 Gb for over $100, or freeware will turn Goggle's free mail service into a 2 Gb disk.
Oh, read you backedup up last week. That is amazing. You must have a consultant, or be one. Nice work.
Bruce

Does this sound like a logic board problem? Blue screen

I have a G4 1.33GHz iBook 14". Recently it has started having problems with freezing and booting. It will boot normally, but a few seconds or minutes into use, if freezes, and only a force shutdown with the power button will work. Then, when it restarts, it may run fine, or may freeze up. Sometimes when it boots, the apple logo shows up, then the spinning wheel, then a light blue screen. And then, nothing.
I have tried all the usual stuff, including starting with the 10.4 DVD and running disk utility. Also Onyx and version 3.03 of Disk Warrior. It wouldn't boot from the Disk Warrior CD usually, and the one time it did, if froze up.
SO, I ended up booting it in Firewire Target Disk mode, and reformatting (zero'd out) using my MacBook. Then, reinstalled the 10.4 and upgraded to 10.4.7 using Software Update. It worked fine for about two hours, and then started freezing and blue screening again.
Does this sound like a logic board thing? It just occurred to me that I haven't tried all this stuff with my additional 1 Gb stick of RAM out. It hasn't caused any problems before, but I suppose it might affect this, no?
Sorry for the long post, but I want to try to diagnose and fix BEFORE it goes off to Apple to be returned with a "we can't demonstrate the problem" message and a bill.
Thanks
Roger

I took out the 1 Gb stick and it did the same thing. About half the time it boots, works for a little while then freezes up. The rest of the time it won't boot past the spinning wheel then the blue screen. Same deal with the OSX DVD and the DiskWarrior CD.
Frustrating. I may have to send it in.
RDS

2006 Mac Pro corrupting the disk - possible logic board problem?

Hi there.
I bought a faulty MP (2006) that wouldn't install an OSX. It would install to a point and then fail or install fully then not boot. Apparently this happened shortly after a 10.5.8 update failed mid way. The seller told me how it seemed to corrupt hard disks placed into it. How he diagnosed this I don't know.
I bought it and did a fresh 10.6 install on a formatted disk in my other 2006 mac pro. Then swapped the disk into the faulty mac pro. Everything seemed fine. Booted up and seemed to work fine.
Upon trying to install itunes 9 I had all sorts of issues (which I've read about). Upon doing a disk check in disk utility it seems the disk has loads of errors, imcomplete nodes/trees etc. Repairing the disk isn't working (in the OS as well as booting from the DVD).
Has anyone encountered anything like this? It seems the disk is getting corrupted by something or other. Hardware tests check out fine.
Could this be a problem on the Logic board?
Thanks

One thing I did notice that I thought was odd was on the grey boot screen a small empty progress bar appears for a second or two and then vanishes. Sure this is the same progress bar that appears on an efi update etc.... not sure it's connected

G5 and logic board problems

I recently acquired a used G5 2.7, fortunately with 2 years more of Applecare.
Has all the symptoms of a bad logic board, and will go into the shop as soon as I have some time to transfer data and block out a couple weeks of machine downtime. Board had apparently been replaced earlier. How pervasive is this problem with G-5?
Just had the same problem with a G4 iMac 1.25.

Throwing caution to the wind....
the country of origin on the board may be a guide to reliability, in my limited experience North American and European boards seem more reliable than the Asian boards ( then again I'd say Korean is supieror to China )

TiBook Won't Reboot - Logic Board Problem?

I've got a TiBook 667mhz that isn't rebooting. A few weeks ago, I noticed that it took me a number of attempts to get the TiBook to reboot. To temporarily solve the problem, I just put it to sleep instead of shutting it down.
But in the last few weeks I had to shut it down. When I did, as before, it took a few hours of waiting and a number of attempts, but it finally rebooted.
Yesterday, I finally took it in to the Apple store to have it checked. They had to shut it down to perform certain diagnostics. Of course it didn't reboot and has been unable to reboot since then.
When I try to reboot -- either by pressing the power button, or Control-Apple-Power, I hear it trying to restart, but there is no chime or video. But, if you listen, you can still hear that there is something going on inside. So, it is getting power.
The guy at the local Apple Store Genius Bar believes it's a problem with the logic board. He reset the PMU and the PRAM, but neither attempts were able to get it to reboot.
Also, to see if it was an issue with just video, the guy attached an external monitor, but saw no video there either. At that point he came to the determination that it was a problem with the logic board.
Love to know your thoughts or any suggestions for a solution.
Thanks!
PowerBook G4 667mhz DVI Mac OS X (10.4.9)

Matthew
I have a 867MHz TiBook showing the exact same problem. The whole won't boot up thing has happened 3 times in the last month, each time taking several attempts over several hours to get a successful boot up. I usually just keep trying the CTRL-OPTION-POWER restarts over and over again with the odd PMU reset button press, sometimes removing battery and power overnight.
Here are a few observations for you to consider to see if we have a common thread. Also, as I'm hoping to upgrade to a new MacBook Pro in the next few months, that while my TiBook is up and running at this moment I'm unwilling to shut it down to test my theories.
Firstly, I think I've realised that everytime I've had an unsuccessful reboot I've been running off battery power. Secondly, inbetween problems I've updated software and rebooted several times successfully when I know for sure I was running on AC power. Thirdly, I have a third party replacement battery installed since my original one died a year ago. And fourthly (just in case), the problem arose since I updated to 10.4.9
I'd be interested to see if your experiences fit in with mine. In the meantime, my TiBook will only be put to sleep and I won't to updating any software that requires a restart if I can help it, and not without AC power. And for the record, I found on another thread somewhere here about 'reinsulating the trackpad ribbon cable' - I tried that and it made no difference. And trying to boot from the 10.4 DVD made no difference either.
Looking forward to hearing from you,
Simon

Logic Board Problem on 1.2Ghz G4 iBook?

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