PowerMac G5 Dual 2GHz freezes any time, boots sometimes with one processor

Can you tell me how to do this from open firmware. That is turning off CPU 1.

i write this to a english people today :

dear Alex,

a reflow costs about 150-280 € (the boards may be take more reflows) . Shipping with UPS costs 42,13 € to england (UK) Reflow we make all at same day then the next day we test in the morning and send back ore make a second reflow. In worst case we need 4 reflows to fix all. Please send not the Mainboard, we have a testingstation for them, but it is better we have the Mac here, because we check all and then we be shure that all work. Please dont send your HDD, put them please out. Please send in "Orginalkarton" with adress and telefonnumber and emailadress.

best wishes, always looking forward

Jürgen Geissbauer

www.golytronic.de

for all : we had found out all faults about Apple and can fix IMac, Cube, all powersupplies, Powermacs and Pro and Macbooks. we always fix them by the really problem and dont chance a Mainboard or supplies. we can repair them.

I am also the owner of a 4.5 year old G5 2.0 GHz that has just gone belly-up. Just got off the phone with the Apple authorized service nearest me (one hour away) and was given the estimates for diagnostics and repair, none of which are very palatable. This experience has taught me to stay away from high-end Macs. My investment in Mac software is such that I cannot make the switch to PC without losing even more cash, but I will hereafter purchase only the bottom-basement model.

Add me to the list as well. I have spent $100 on diagnostics from an Apple Certified Repair shop. They swapped positions of my two CPUs and recalibrated. Everything worked fine for about a week and now it's dead. This is my first Mac. I spen a lot of money on this computer and the re-purchase of Mac versions of all the software I already owned. I am definitely not outperforming this computer and would be quite happy with it for another five years at least. I was hopeful that the "AppleCare" program would honor the apparent defect given the number of complaints out there about this same issue. I spoke with corporate customer support and they basically blew me off saying 4 years is a respectable lifespan for a computer. Are these people new? That's ridiculous. Cost for a new logic board is about $1,300 not including install and then you're still left with a defective PowerMac that will fail in a few years. It's like throwing good money after bad and frankly I don't want to give Apple any more of my money. Cost of a new and better pc laptop is about $700, but I have to purchase all new Windows licensed software since I converted all my licenses to Mac 4 years ago. Quite a dilemma. I think a class action lawsuit is in order. Anybody in?

Yet another person here to add to the list, same symptoms. Mine died a few months ago causing me big loss in income. Very disappointing. I've spent a lot of money with Apple - had 6 macs over the years, 1 survived. I sold my G4 just before my G5 broke (wish I'd kept it). I'm hoping my new Intel based macbook won't fail me, if it does, I'm finished. Thanks for your 'support', Apple.

The sad story (condensed version) of my G5 dual, 2.3.
Bought new, kernel panic every week or so.
Did every possible trouble shooting trick and test.
Apple store would not do anything about it.
Tried a random suggestion of setting processor performance to highest. That fixed it.
Time passed, the power supply then logic board died and were replaced.
Still have the machine but it has been replaced by a MacPro which has been trouble free.
The end.

Same here, my G5 Dual 2GHz is now running on only one CPU. I originally had problems just after the machine was a year old and out of warranty. Apple let me buy an additional years warranty and replaced the motherboard. Many years later and It's been working fine, until about a week ago ... Not sure what to do now, certainly can't afford £1900 for a Mac Pro! Sounds daft but I may end up using my old G3 running OS9.2 for a while!!

What 2.0Ghz version you have, Pavaise? I'm have Late 2004 and I'm having lots of troubles with this machine, in booting and in use. When I look at the kernel panics it seems that it its always CPU1 which is hanging or atleast mentioned in the logs. I'm considering removing the other processor to see if that cures the problem but I have Googled that not all models will work with the other processor removed, curious to see if mine will?

You can disable CPU #1 without removing it with CHUD Tools from the Developer's site.

But as I'm having problems with booting, does CHUD affect OpenFirmware etc, right from the beginning? The processor cannot be totally broken because GeekBench and Xbench both run flawlessly, also all AHT and ADS -tests run normally.

Of course it might not actually be the processor which is the problem...

I also have a late 2004 machine. I'm just lucky it's running on only 1 CPU at the moment, but I guess it's only a matter of time ...

Another one bites the dust...My 2x 2,5 Ghz G5 PPC went AWOL today.Same symptoms (it started about a week ago and today it's impossible to even boot).It's a late 2004 and I've paid 3000 eur for it.Worked fine for 5 years (bought it in Jan 2005) and just died.I'm not happy at all,just like all of you,since I'm using it for professional music production and need it everyday.We happen to have a second G5 at the studio (the ones with water cooling),but I'm starting to worry after reading all these posts.I really don't want to go for the 1000 eur + repairs,since it doesn't seem to be worth it...I might call Golytronic in Germany,but it will depend on their fee...I've been using Mac for 10 years now,I own a G4,a (dead) G5 and a MacBook Pro...We do need a solid machine for our studio and I might be forced to buy a Mac Pro now since we are Logic Pro users and it only runs on Mac...5 years is not a long time for a 3000 eur computer...it's a JOKE.Thank you Apple.

Hi MVISION, and a warm welcome to the forums! 🙂

I feel your pain, but see...

http://www.xlr8yourmac.com/archives/feb10/021010.html#S26535

Hey BDAqua

it's cool that they replaced the liquid cooled damaged G5s with new Mac Pros in some cases...our Liquid cooled G5 at the studio (our 2nd G5) is working just fine now,the one which has a problem is not liquid cooled...will try and contact Apple for sure,but as it's a 5 year old machine,way past the apple care 3 years guarantee,I'm not sure they will do anyhing about it.It's a defect on the machine though...there's that company in Germany (golytronics.de),on their website they are positive they can fix the problem (by 'reflowing it).I'm not sure how much it would cost though.I will call them for sure.For now I feel bummed and ****** off.We'll see what happens...Good luck to y'all !

Tenoch T

I am actually having the same problem you are (ha, Almost to the T.) I have noticed that the system works better if you do not shut it off after you manage to get it started. Otherwise, this is an extremely frustrating problem that I have yet to figure out. I have ran hardware checks, swapped drives, checked Ram, booted externally and have had absolutely no luck! Well, scratch that, I did actually perform a re-install of the main OS and that seems to have helped the system (in a minimal sort of way.. but help none the less..)

I will say, that the problem is defiantly worse within the first hour (or so) of startup. It seems that if you make it through the first hour after boot (ha, call it "Post Boot" if you will), then the system does not want to crash as often, or possibly not at all.

Seeing as how the system only sometimes goes nuts (Max fan acceleration and possible freezing) during sleep mode, I found that leaving it on and letting it sleep is a much better option to turning it off and hoping that it boots up again.