Dual G5 Logic board/power supply dilemma

I have a (late 2005) dual 2.3 that has been dropped 3 Times!
It is on it's third power supply. The repair center that was in fault is now replacing the case and logic board. My questions:
Does the fact that it has/had a faulty logic board be contributing to the power supply failure?
Should I just be done with this machine and move on once the new logic board is installed?
I'm skeptical to a unit that has been thru so much abuse, but at the same time doesn't new logic board & case = new computer?
Your thoughts
Thanks

Hi! I'm surprised it survived the first fall let alone the second and third. The g forces could have damaged both the MB and the PS and if a repair center had dropped it I'd be inclined to want a replacement. Tom

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1.8Ghz & Dual 2.0Ghz Logic Boards/Power Supply

I have a perfectly fine working 1.8ghz G5. I also have a dual 2.0Ghz G5. However, the dual doesn't power up. I'm pretty sure it's the power supply. But, I'm not positive.
My question is. Is it possible to put the dual 2.0 logic board into my 1.8ghz machine? The inside of the cases look very similar. Or is there a way to test the logic board of the 2.0 before I take everything apart?
Thanks..

The CPU speed of a PowerMac G5 is always 2x the bus speed or less. Thus, with the 900 MHz bus speed of the 1.8 GHz motherboard, your 2.0 GHz CPUs would clock down to 1.8 GHz at best.

Plugging in redundant on-board power supply

HI,
Is it possible for me to plug in and turn on on-board redundant power supply for a 4402 WLC that is already online and in production without any disruption to Wireless users and APs attached to that same controller?
Thanks, Pat.

That power supply should be hot swappable. But as with anything having to do with power, you are better served by taking the system down. that way you can avoid any arcing.
HTH,
Steve

No vga new viedo card,mother board,power supply and cable

persario sr550r no vga signal on monitor,new cable,new power supply,new viedo card,new mother board,still no vga signal,I have tested monitor it is good?Do you need to remove any viedo chip when installing new viedo card?I can rebuild a car from ground up!This computer is kicking my butt! help!!!

Terkemoma, welcome to the forum.
Don't let the computer KYB! We'll solve the problem.
First, however, I believe that there is another number in the model of the computer. Once I have the full model I will see what I can do to help you.
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Logic board replacements: supply shortage!

I've seen a lot of threads on here encouraging anyone with a whining MBP to send it in for no-questions-asked logic board replacement, so I wanted to post a quick caveat...
My MBP has been in the repair queue at the Apple Store for a week and a half, and they're still waiting on shipments of logic boards; from what AppleCare can tell, it looks like supplies are hugely diminshed at this point, and the only stock of MPB logic boards is what the individual Apple Stores have on-hand.
Maybe I'm just unlucky, but chances are that if you're hoping for a one-day turnaround in a shiny yellow DHL box to stop the whine, you'll have to wait a bit longer...

My condition with regards to work isn't quite as bad as yours, however I did realize that as soon as I dropped the machine off I had forgotten to commit my last day and a half of work back to Subversion, so I've been just idly touching up things here and there as I don't want to waste a whole day and a half re-implementing something that's stuck on a 2.5" chunk of steel. sigh
Although, if there is a shortage, I'd better get cracking on re-doing that day and a half of work or I'm going to be even further behind on my projects. Thanks for the confirm.
My MBP is CTO, so I'm pretty much screwed on trying to get a replacement before the logic board comes in. I don't think I'll have lost any clients (I've been doing new stuff on my old PB) but I'm definitely not in a comfortable position wrt my existing work. Ah, the perils of computerization.
There is good news: I remember this happening back in the day with the problem-plagued old G3 iBooks, and many of those were just replaced with more recent boards as they became available. Maybe I'll get a 2.16 out of it.

IMac G5 (2004) logic board and the repair extension program

Hi,
I know that there are tons of topics about logic board/power supply troubles witht the first generation G5s, and I'm sorry to start yet another new thread, but I still have some questions about this issue.
I have a first generation iMac G5. Long story short...when I first got it the computer would shut itself off sometimes after I had put it to sleep. When I would try to restart nothing would happen, but usually letting it sit unplugged a while would solve the problem (occasionally when I'd restart a different start up noise would sound and the white light would flash quickly). It happened so randomly, that I just lived with it, blaming the problem on my dorm network, or a power failure. A few days ago I tried to start the computer up and nothing happened (just a VERY faint sound like a clicking or ticking or intermitant humming...definatly electrical sounding). I unplugged it overnight, but the next day still nothing. I decided to go through the troubleshooting steps Apple lists online. The internal power button could not start it up and the second LED does not flash, which according to Apple means the logic board needs replacing. Luckily my serial # is covered by the Repair Extension Program, and I'm bringing my computer in tomorrow morning to be fixed (just in time for back to school).
I have become concerned, while browsing the discussion topics, that this fix may not be permenant. I've read a few posts that claim that they are on their third Logic Boards, and this kind of scares me. My parents bought me the computer (our family's first ever Mac) and did not purchase the AppleCare extended warranty (they had heard how reliable Macs were...hmmm.) I didn't even know that I could purchase AppleCare after-the-fact until it was several months after my 1yr warranty expired. I do appreciate the fact that Apple recognized what seems to be a common problem with this generation of iMacs, but I wonder why they did not contact the owners of these machines to let them know that the problem and repair extension even existed.
So I guess my real question is...Does anyone know if, after this repair Apple will replace the logic board if it dies again? Is there a limit to the number of qualified repairs you can get through this Repair Extension program? Also is there any other Extended warranty type thing I can purchase after my 1yr. warranty is up.
Sorry the post is so long...I'm just scared about the fate of my beloved Mac.
iMac G5 (2004) Mac OS X (10.3.9)

Oh man, am I actually relieved reading this thread. Just took my baby (iMac G5 first generation) in for repairs today, not knowing what was wrong with it. Luckily my serial numbers are in the range, so I'm crossing my fingers that they're going to cover this.
Brief synopsis of what happened, in case it differs from anyone else's
About a month ago, my iMac started to not wake up from sleep mode. Instead of waking up, it would just shut itself off. This continued for about 2 months, with me thinking nothing of it. Then, instead of shutting itself off, the computer would restart when I attempted to put it to sleep.
Then, last night, I was surfing the net and all of a sudden the power just failed. No noise, no "grey screen", we're talking like a millisecond later the screen was black. I treid unplugging the machine and then plugging it back in while simultaneously holding the power button to reset the PSU and still nothing. At that point it was about 1:30 in the morning, so I just went to bed not wanting to deal with it until the next day. By the time I woke up, there was a distinct smell of electrical components burning (in grade 8 shop class we used to hook up resistors to the voltage generator and crank the juice up until they fried when teach wasn't around, so I distinctly remembered the acrid stench :P)
I opened the back up and did the LED check, and #2 wouldn't even blink. So I took it in and they said they'd have to get back to me and that's where I stand now.
The thing that concerns me is that if some of the components fried that there may be possible damage to the motherboard etc. Luckily I'm not too worried about the hard drive because it did still boot up and all. People that have experience with this, what usually happens with files on your HD after a logic board replacement? Are they usually fine?
The other thing that concerns me is that apple has made no effort to contact me, and it will be 2 years after the purchasing date come November 1, 2006. I'm lucky that I caught this now before it was too late.

Exploding Power Supply

Last week the power supply of my 9 month old Mac Pro exploded with a huge bang. I was really scary. No visual damage, but the whole system is fried.
Let me give you a summary of the history:
first repair - Audio failure --> Logic board replaced
second repair - Mac was dead --> power supply replace
third repair - Mac was dead --> no problems found
fourth repair - Power supply exploded --> Logic board, power supply, etc is going to be replaced.
I called Apple and they want to repair my Mac Pro again. My question to Apple was: "How many times do you have to replace parts until I get a new Mac Pro?".
I'm really sad with the quality of my Mac Pro. It's a great system, but it's not reliable. Luckily I've purchased a MacBook some months ago, but I need my Mac Pro to do my job.

Looks like I'm joining the exploding PSU club. I powered down my Pro after work last night (I usually leave it on all the time) and when I came into the office this morning and pressed the power button I got a flash of bright white light from within the case in the PSU area and a loud snapping noise. The thing that I'm not sure about now is how the repair's going to go. Since I work at a University, I have to take the machine back to Tech Services and I'm just praying that I don't get personnally stuck with the repair bill.
Oh, and I've popped out my 3 data drives -- I'm not sending those to tech services with the machine!

ISight/Logic Board Mess

i bought a macbook off of craigslist. i replaced basically everything in the macbook short of the cd drive and ram. i never have been able to get the isight to work, so i bought a new one and installed it today. i still cannot get the computer to recognize the isight camera.
as i was putting the macbook together i noticed that a small gold or copper metal piece that is located above the airport card was broken off. it's a metal piece that bends and curves almost giving it a spring-like function....if that makes any sense.
i ran a hardware test to see if i could find the isight problem and i got the error: 4SNS/1/40000000:TBOT. I have tried resetting everything on the computer, i have followed all the support pages that apple has to offer. does anyone have any ideas? could the gold piece have something to do with the error or would that be what is messing with the isight?
obviously my cpu is not under warranty. i'm not sure where to go from here. any suggestions would be appreciated.

UPDATE:
Apparently the error that I was receiving was fixed when I put the battery back on. Upon retesting, with the battery on, I could not get the error code. However, when I tested without the battery the error came back.
Here is the current situation. The iSight is still not being recognized. I have done everything suggested by apple, this forum and other forums as well. I then reinstalled Leopard...nothing. I also noticed that the battery is not being charged. The weird thing is that when you click the battery, in the top-right-hand-corner of the screen, it states that a battery in not connected...but, when I go to the System Profiler under the Power section it tells me the charge information (in which there is not a charge), cycle count and the condition of the battery. So obviously something is recognizing the battery. The cycle count and condition is good which eliminates that as a problem.
So, here is what I am wondering:
a.) How can the battery be recognized in the System Profiler, but not in the task bar?
b.) If there is a problem in the cables (or whatnot) between the battery and logic board or the iSight camera and logic board, would that show up on a hardware test?
c.) Would starting over by wiping the hard-drive, reinstalling the OS with the original disks I got with the CPU, updating, reinstalling Leopard and updating help? Maybe there is some missing files or drivers?
d.) Could there be a problem with the iSight portion of the display inverter without it interfering with the actual screen portion?
I bought the Macbook used (cheap) and have replaced everything in the computer (logic board, power supply, hard-drive, bluetooth, etc) minus the cd drive and original RAM.

What do you think-Power Supply or Logic Board??

I came across a used dual 1.0 GHz MDD G4 that will not start. When the power button is pressed, the power LED will light and then go out. There is no chime and the fans all come on incredibly loud and fast. The logic board has a small red LED between the CPU and RAM slots. Does the red light mean the board is working or good?
I've swapped CPUs and got the same result. If it was a power supply issue, would the fans and logic board power up like they do? I've put a disc in the drive and can hear activity, but nothing ever happens. Also the power supply looks to be smaller than the other MDDs I've used. It also has a large separate fan at the end towards the front/speaker area.
At the same time since the logic board has the red light, it would seem that it's working also. Right? I just need help deciding what to replace next. Thanks in advance.

Here is a link to the front panel issues in general:
http://www.xlr8yourmac.com/tips/MDDps_mods/MDD_PSMods.html
The front panel with the mirror doors was off. I used a small screw driver to >push the small start up button
Thus you did not disconnect the front panel BOARD. It has it's own connector to the motherboard. If you disconnect it and then short the green lead (Powerup) on the PSU connector to the adjacent black one (GND) you are bypassing the front panel button for booting. Do this only at your own risk if you have a solid electronic experience.
Here is a helpful pinout scheme:
http://www.smalldog.com/newsarchive/techtails_display.php?id=44
Hans

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.

IMac G5 won't start up - logic board or power supply?

My oldest son killed my iMac G5. Apparently he'd taken to sneaking downstairs in the middle of the night and watching videos on YouTube. One night, during his viewing session, the iMac threw up a kernel panic and the fan came on. My son tried to turn off the iMac but couldn't find the switch. So *he went to bed and left the iMac with the fan on full-blast.* When I came downstairs to go to work, 6 hours later, I turned off the machine, waited for a minute or so, and then attempted to turn it on.
The iMac is stone dead. Will not turn on.
I'm deathly afraid the logic board is cooked. Those things are damned expensive. I held off on doing anything for a while, but then I was talking offhand with a Genius at a local Apple store. He said it might be as simple as a power supply. Which would be great - $125 is a lot cheaper than $800, and I could do this repair myself. But I don't want to sink $125 into the machine unless I have a pretty good idea that this will, in fact, fix it.
Anyone else had this problem? Did it turn out to be the logic board, or the power supply, or something else entirely?

First off, the kid is grounded - second, which model do you have? Have you tried resetting the SMU? Resetting the SMU can resolve some computer issues such as not starting up, not displaying video, sleep issues, fan noise issues, and so on. If your computer still exhibits these types of issues even after you've restarted the computer, try resetting the SMU. To reset the SMU on one of these iMacs:
1. Turn off the computer by choosing Shut Down from the Apple menu, or by holding the power button until the computer turns off.
2. Unplug all cables from the computer, including the power cord.
3. Wait 10 seconds.
4. Plug in the power cord while simultaneously pressing and holding the power button on the back of the computer.
5. Let go of the power button.
6. Press the power button once more to start up your iMac.
Let us know if this helps,

Anyone else waiting on a replacement Power Supply & Logic Board from Apple?

On Dec. 26, I took my iMac G5 to my local service provider to resolve some power issues under the Repair Extension Program. They ordered the part (new power supply and logic board) from Apple that very day, yet I'm still stuck here waiting 16 days later.
Anyone else out there waiting for this part to arrive? How long should it take? Can I call Apple directly in order to get a better estimate?
Thanks!
1.8 GHz iMac G5 Mac OS X (10.4.8)

All right, so here's the latest plot changes in the ongoing saga of my iMac G5...
I spoke with two very kind and helpful women at Apple this afternoon. Both agreed that this sort of behavior from my AASP was certainly unacceptable. I was able to lodge a formal complaint against my AASP, as well.
My particular part order was given some sort of high priority status by Apple. I was asked to call back on Friday to receive an update on the order's status.
I was also asked to send a letter to Apple's Corporate Customer Care division explaining my situation in full. I'll try to send out this letter within the next few days.
So that's where we stand right now. No computer yet, but at least SOME progress is being made.

Power supply or logic board failure

First time post, long time Mac user (since 1983). My older iMac G5 1.8 GHz Power PC (ALS) occasionally fails to start when I press the power button or the internal power button on the logic board. The only solution is to unplug/plug the external power cable where it meets the power supply housing (not at the outlet). None of the capacitors seem to be bulging on the logic board, LED1 always lights up, LED2-4 fail when there is a problem but are normal after unplug/plug routine. Noticed that there was no internal Lithium battery where one is supposed to be, but this has been the case for 5 years, so this is probably not the issue. I suspect the power supply. It's an old iMac with plenty of leg left and will be used as a second computer in the home. Any ideas? I don't have a volt meter, but am willing to get one if the test points are easy to get to (I'm not an electronics wizard).

Welcome To Discussions - If resetting the SMU, which is in effect what you are doing, solves the problem and the caps look ok, then the prime suspect would be the power supply unit. They are not expensive, check out [synaptech.com] for prices or[welovemacs.com] whcih will also give you instructions on how to replace it.
It would probably be a good idea to replace the battery it's CR2032 3 volt lithium button, easily obtainable at Radio Shack or similar places.
Let us know how you make out,

Logic board and power supply symptoms on a Mid 2007 I Mac Intel

does anyone know what would cause my Mid 2007 Imac to quit abruply? On tun on the super drive spins up for about 5 sec and then spins down. No display No Nothing!! It was working fine up to this point. Could it be the power supply or logic board?? What other componants are in there that would cause this problem.
It is my daughter- in- law's Mac and they don't have alot of money to fix it so if I could fix it that would help.
THX for Ur Time!!

Unfortunately no one hear can truly diagnose the problem.
1. Run the Apple Extended Hardware Test using the original Install DVD 1 that came with that iMac.
Intel-based Macs: Using Apple Hardware Test
2. Call your local Authorized Apple Service Provider and have them test it.
How to find your nearest Apple Authorized Service Provider (AASP) or Apple Authorized Distributor (AAD)

6-month old Mac Pro has already had a new logic board and power supply

At a cost of $400 in shipping and a one-month wait, my 5-month old Mac Pro got a new power supply and logic board
Now I keep getting kernel panics, runaway kernel_task in Activity Monitor, and corrupted boot drives
External Firewire drives work some of the time, and occasionally my USB devices dont work either
This computer is a nightmare - how do I begin to figure out if this is OS (10.6.4) or hardware related?
The extended AHT test reports that all is OK - as does an extended memory test using Applejack
Should I do firmware updates and re-install the 10.6.4 combo pack, or am I just wasting more of my time?
I've got 4 macs and this is the only one that works badly - I think Apple's OS updates are getting as bad as Windows updates

My first question is why you spent $400 to get a 5 month old system fixed. That should have been covered under the warranty. So someone ripped you off, or you left out some key details.
And if you had both the logic board and PSU replaced, did you ever stop to think that maybe the problem lies with the power coming into your house? It's not really the big power spikes or blackouts you need to worry about, since those are pretty rare. What you need to worry about are the small fluctuations in voltage that happen several hundred times a day, if not an hour. Sometimes there's not quite enough power, other times there's a little too much, and all of this takes a steady toll on the PSU. It will do what it can to try and feed the rest of the computer a steady diet of electricity, but sometimes a jolt will get past it and start damaging other components. It could even cause data corruption on your HDD.
If the PSU and logic board already went, who knows what damage it may have caused to anything else. It may just be taking longer to show up.
It might also be that whomever ripped you off to the tune of $400 simply traded you one defective logic board for another. Or maybe they don't really know how to protect against ESD. I once saw a repair shop where the techs smoked in the same room they did the repairs. Sadly, for every one good tech out there, there's probably at least 3 complete idiots. Kind of like auto mechanics.
And I never have problems with Windows or Apple updates. Seems like on Windows the majority of people who have problems with updates are either running some program designed to change the way Windows looks or messes with low level system files, or they have a malware infestation they were unaware of/oblivious to. Most of the people who have problems with Apple updates seem to be the same way. They're running some truly bizarre programs that mess with the system in ways programs were not intended to mess with the system. There's generally a reason OS vendors provide an API for developers. You deviate from that at your own peril.

Dual G5 Logic board/power supply dilemma

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