IMac Logic Board Issue...

Here is a little history:
Bought an iMac G5 1.8GHz in February of 2005. In October of 2005 I had the power supply and logic board replaced. In August of 2006 I had the logic board replaced again. In July of 2007 I had the logic board replaced AGAIN...
I am once again having issues with what I think is a faulty logic board. I had a "Must Restart" grey pop-up yesterday. Did an SMU reset, then restarted the computer. It worked for 24 hours. This morning it did the same thing. I restarted, but it went to a blue screen and stayed there... I did a SMU reset, and a PRAM reset. Then called Applecare and they hinted I should do a disk repair with the install disk... Tried that. The computer won't boot from the disc when pressing C on startup... just goes to Blue Screen after grey apple screen and freezes.
I tried starting up whilst holding the "Option" button. Both the Macintosh HD and OS X Tiger DVD are found, but once again, it won' boot from either. Just to the Blue Screen and that is it.
I am over 3 months from my logic board replacement time frame... besides, I think the last replacement of it should have taken care of it last July, right? I have opened up the computer, and there are 5 leaking capacitors...
I am right in thinking the Logic Board is fried, right?
What would you suggest doing? Trying to get another logic board for free from Apple, even though I am beyond warranty? I DO NOT want to pay 800-900 bucks for sure. Any other tips or suggestions? I figure I could get a SATA/USB2 enclosure for the HD if I get another mac... not to mention I am a pretty good back-upper...
Thanks!!!

I have a first generation 20" iMac G5; the logic board failed about a year ago and was replaced under the "iMac G5 Repair Extension Program for Video and Power Issues" program at my local Apple store. It failed again last week; I returned to the Apple store and was advised it would not be covered as it has passed the 3 year mark outlined in the program and was offered a 20% discount on purchasing a new iMac (I did not feel this was a reasonable resolution). I contacted AppleCare via telephone regarding the issue as I felt Apple should support a product with a well documented defect. The "Product Specialist" I spoke to stated "my original logic board had been replaced with an updated one" and "the failure of this current logic board is unrelated to the Extension program failure". He then went on to contradict himself and stated "Apple could not / would not continue to support the logic board failures after the 3 year mark". I was offered no resolution; I am a long time Apple supporter, advocate and evangelist who has advised friends, family and colleagues to purchase Apple products. I am now extremely hesitant to do so after this incident. As this is a recurring and well documented issue with this product, I feel Apple should either replace or offer a replacement iMac at a HIGHLY substantial discounted rate to any customers impacted by this product. Hundreds of posts here and at other forums show there are many unhappy customers.
<Edited by Moderator>

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Hey everyone, while waiting for answers on my other post, I'm going to start this discussion to see what you guys think of this on going logic board problem. (To see my situation look at my other post.)
I think this logic board problem is very similar to the "Windows Vista" problem. They are rushing to produce so many logic boards that the quality they produce is complete junk. Alot of people are having this problem but why has Apple not yet fixed this issue? I have read alot of posts of getting the board replaced only to find out that the replacement board is also faulty.
     Right now I'm just very aggrevated because the closest Apple Store is an hour drive into the city (Melbourne, Australia). I made that trip yesterday and waited as the replaced the Hard Drive and RAM only to find out today that the problem is probably the logic board. I really want to get my MBP working as I am a student and a musician. I thought this was going to be more of a good investment and not a big headache.
     Also what is the process to getting the Logic Board replaced? How long does it take? And for people who are out of warranty, how much will it cost?
     Luckily, I guess, I bought this Macbook about 2 weeks ago so I am still covered by the warranty but it is a shame that I actually needed the warranty after 2 weeks of the purchase.
     I want your opinions! =) I do like Apple but right now I am just really frustrated >=(

Hi Bruce, sorry to hear of your frustrations. First off, Apple doesn't make logic boards. Heck, Apple doesn't make any of the parts under the hood of your computer. I'm surprised that on a two week old computer they didn't just offer you a replacement. Was the computer purchased through Apple or did you buy it 3rd party?
When you say... "alot of people are having this problem." What are you using for your sample size? How many, what proof do you have that there issue is the same as your issue? Is it with the same make/model computer that you have?
A logic board replacement is a pretty straight forward replacement. A good tech can be in and out and have service verification in about an hour (uninterrupted). Typically though the process is a 3-4 (or more) turn around at Apple Stores, simply because they will sometimes need to wait for the part and your machine may not be first in line at the time it is received.
Out of warranty logic board replacements are very costly, definitely the most expensive component to replace in the machine.

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Message was edited by: xgamercrazy

If it's under warranty, call Apple and send it in for repair. If not, get a second opinion from another store.
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First up, PowerPC-based Macs can't boot up from a USB external drive (per se... there is a workaround and "hack"). Only Intel-based Macs can do that.
Second, since you say it works and boots up when connected to a FireWire external drive, I believe it is a hard drive issue. S.M.A.R.T. status is not ("not") always a reliable indicator from what I've heard. It may say it's verified, but really it's failing. By the same token, it may say failed, but really it's fine.
That is not always the case however. 95% of the time, S.M.A.R.T. status is highly accurate.
If you are so inclined, you can open up your PowerBook, take out the hard drive, and place a new one in there and see what happens. If it works, you're in business. And you only spent a $100 or less on a new drive (which you might end up needing anyway if your current drive is indeed broken).
(If your drive isn't broken, then you have a backup drive ).
If the new drive installed doesn't work, then it is a logic board issue or something else. But since you say it works fine and boots up from a Leopard install DVD, I think it may just be the hard drive. And a new logic board usually starts at $300 so think about that as well. (You could get a new used one for a bit more and sell that one for parts).

Power supply vs. logic board? turns off in sleep mode.

My imac g5 (2004 - 1st generation?) is either turning completely off or going into some un-wake-up-able mode after it's put to sleep. (I have to switch off/on the power strip and turn the computer on all over again.) And sometimes if it's sleeping (power light pulsing on front) it may or may not wake from sleep by pushing the power button. Often touching a key in that circumstance will cause it to crash, so I've quit using that altogether as a method of waking it up. I've reset the SMU a number of times throughout the past few months and it has not cleared up this problem.
Last night after I put it to sleep it switched in to the un-wake-up-able mode. I could still hear something running (not a fan, just an electrical hum) where it seems like it's crashed and can't shut itself off. I had to turn off the power and try to turn the computer back on. It wouldn't respond the first couple times. Then the power light glowed for a while but it still didn't turn on completely. After a few more minutes I tried again. Maybe I held the power button for too long, but I heard a long single beep, the fans whirred, and then everything started up as usual.
I've read a number of threads seemingly related to these issues, but am now not clear about whether this is a power supply issue or a logic board issue. I have yet to open the back and check for bulging capacitors. Just thought I'd ask here first.

I am having a very close issue too (posted also in a more recent thread about power button not functioning). My old iMac G5 20 inches got a power supply that went bad two years ago. I had it replaced and all went fine until two weeks ago.
My wife was using it, while I was away: machine shut down with a 'pop!' sound.
She tried to start it up again, but after pressing the button a couple of times - the last one longer - she had a long strong peep. The machine went on for a while and then off again. Scared, she left it off.
After checking, no reported issue seems to fit to the problems shown: power supply is working; logic board too. The machine is working fine, but on sleep, it dies out. While doing tasks, at undetermined times, it shuts down with a 'pop!'. Sometimes you can restart it immediately. Sometimes you can't and have to wait one or more hours. No evidently bad caps on board, led check returns 1 (no 2 flashing or attempting to turn on) with dead computer, otherwise all working fine. Hardware test also passed. Console messages have nothing relevant or clearly understandable to offer.
Still can't figure out a solution. Many user are pretty fast in suggesting to bringing the machine to Apple. Unfortunately not all around the world we have/need cars. And getting the 20 kg of iMac by feet/metro to the shop it ain't such a nice walk. When I fried the power supply, there was no sufficiently large box on sale to pack the computer and have it send to the shop. I had to wait for the technician - on a convenient day - do drop by and take it (and he knew he was going to repair it)!
Will post, if I have further developments.

Many kernel panics, possible dead logic board?

I hope someone can help my diagnose my recently quirky iMac G4 1 ghz 17 in flat panel. I currently have a 250 G Seagate hard drive, 1 G memory. It's running Tiger 10.4.11...or attempting to run it.
This computer ran beautifully until several weeks ago when I foolishly attempted to upgrade to Leopard. Only about a third of Leopard got installed when the system froze and crashed. I managed to access the hard drive and did a complete wipe and install of good old Tiger, upgraded to 10.4.10 which ran without a glitch in the past.
However, even after this clean reinstall I continued to get freezes and kernel panics. I repaired all permissions carefully after each upgrade and I ran Disk Utility with no problems detected and no repairs needing to be done. I tried to run Disk Warrior to double check but continued to have system freezes and kernel panics while running Disk Warrior!! The panics were/are intermittent. The computer behaves fine until I've used it for a few hours, then crashes, usually while I am in Safari or iTunes, but occasionally I will get a panic at start up.
I have replaced the hard drive with a brand new one as it was still under warranty. I tested the memory and determined by process of elimination that the stick of RAM on the logic board was not functioning. I replaced that.
So, I have a new hard drive and functional memory and tried a Tiger fresh reinstall yet again today. The system continues to crash episodically...used the computer for a few hours this am before I got a kernel panic. This afternoon it resuscitated itself enough to let me put upgrade 10.4.5 on it and crashed in the middle of the upgrade! Bear in mind the machine's run all these upgrades and functioned fine in the past.
I think I obviously have a hardware problem and since I've recently replaced the hard drive and both memory modules as well as done a fresh reinstall of the OS version this iMac used to run perfectly, I'm thinking I have a logic board issue.
Any opinions or suggestions on how I might get these issues worked out would be very much appreciated!

Thanks for responding. Yes, I've already followed all those suggestions to the letter. Unfortunately I do not have the original Apple Hardware Test disc that came with this computer. I have oredered a copy of Tech Tool Pro and plan to run it but it has yet to arrive.
I let the computer rest overnight and it booted right up and so far no freezes or panics, I've been using it about a half-hour.
Of note, in the kernel panic log folder it says,
Unresolved kernel trap(cpu 0): 0x300 - Data access DAR=0x0000000017FCBA10 PC=0x0000000000081F1C
Latest crash info for cpu 0:
Exception state (sv=0x2E9CC780)
PC=0x00081F1C; MSR=0x00009030; DAR=0x17FCBA10; DSISR=0x42000000; LR=0x0008223C; R1=0x17FC3A60; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x0008223C 0x00062D04 0x000A81F8 0x000ABD00
Proceeding back via exception chain:
Exception state (sv=0x2E9CC780)
previously dumped as "Latest" state. skipping...
Exception state (sv=0x2E9CB000)
PC=0x00013110; MSR=0x00009030; DAR=0x006D55FC; DSISR=0x40000000; LR=0x0001227C; R1=0x17FC3DA0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x00000002 0x0001227C 0x00022864 0x000AC02C 0x1E010000
Exception state (sv=0x2EA7A780)
PC=0x9000B208; MSR=0x0200D030; DAR=0x901A640C; DSISR=0x40000000; LR=0x9000B15C; R1=0xBFFFF100; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.4.0: Tue Jan 3 18:22:10 PST 2006; root:xnu-792.6.56.obj~1/RELEASE_PPC
panic(cpu 0 caller 0xFFFF0003): 0x300 - Data access
Latest stack backtrace for cpu 0:
Backtrace:
0x00095718 0x00095C30 0x0002683C 0x000A8384 0x000ABD00
Proceeding back via exception chain:
Exception state (sv=0x2E9CC780)
PC=0x00081F1C; MSR=0x00009030; DAR=0x17FCBA10; DSISR=0x42000000; LR=0x0008223C; R1=0x17FC3A60; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x0008223C 0x00062D04 0x000A81F8 0x000ABD00
Exception state (sv=0x2E9CB000)
PC=0x00013110; MSR=0x00009030; DAR=0x006D55FC; DSISR=0x40000000; LR=0x0001227C; R1=0x17FC3DA0; XCP=0x0000000C (0x300 - Data access)
Backtrace:
0x00000002 0x0001227C 0x00022864 0x000AC02C 0x1E010000
Exception state (sv=0x2EA7A780)
PC=0x9000B208; MSR=0x0200D030; DAR=0x901A640C; DSISR=0x40000000; LR=0x9000B15C; R1=0xBFFFF100; XCP=0x00000030 (0xC00 - System call)
Kernel version:
Darwin Kernel Version 8.4.0: Tue Jan 3 18:22:10 PST 2006; root:xnu-792.6.56.obj~1/RELEASE_PPC
I hope this might help. Thanks again.

IMac Logic Board Issue...

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