1 2 Previous Next 25 Replies Latest reply: Nov 9, 2012 2:29 AM by Robert Albury Go to original post
  • 15. Re: powermac g5 memory problems
    Jacumba Level 4 Level 4 (2,325 points)

    I didn't think the ram was bad either, I've seldom seen ram go bad. I've seen the slots on the motherboard that the ram plugs into go bad, that is more common. But from what I've seen when the slot does go bad it doesn't recognize the ram at all for that slot.

    Where you mentioned freeze up and rasping sound. Those are symptoms I've seen with a bad hard drive. first the computer will get erradict, then as the hard drive gets worse, you'll get odd sounds from it, something like the rasping sound you mentioned. So I don't want to say go get a hard drive, I'm not 100% sure, but the symptoms are there.

    It's absolutely not the thermal paste.

    I've notice in the last couple of weeks on craigslist two G 5's showed up for $30, in working condition..Check around and see if you can pick one up for spare parts. If you find the same model it should have identical hardware in it. What model G 5 is this?

    Also I don't know if it's been mentioned but have you checked the pram battery on the motherboard? You can get it tested for free at radio shack.

  • 16. Re: powermac g5 memory problems
    japamac Level 7 Level 7 (24,390 points)

    Don't tell me it don't

    Great, another "I know better than anyone" type.....

     

    IN GENERAL practice, and due to THE FACT that the G5 has a DUAL CHANNEL controller that DISTRIBUTES RAM between processors, for the G5 NEEDS RAM to be installed in sized pairs for NORMAL function to occur.

     

    Swapping PAIRS is a valid troubleshooting technique. Swaping one DIMM within a pair is a valid troubleshooting technique, but running unbalanced RAM will yield unreliable results.

    So don't post to me unless you know what your talking about

    I love you NOOBs that buy a used, junk Power Mac or two, come here begging for hellp, and after post like you have experience that transcends those of us that have used Power Macs from the time they were new.

     

    If you wish to be part of the community, then it would be best to practice some decorum.

     

    I'd like to see SUBSTANTATED technically correct proceedures or tested troubleshooting techniques that are VERIFIABLE, not just "because I know better".....

    I know that people who come here looking for help wany verifiable and tested. Vodoo is best left to other forums.

     

    I have a Mac that doesn't suppose to take a hard drive over 50 GB, well I put a 80 GB in and it worked.

    And what does that have to do with a G5 and it's related memory failure or memory controller BGA issue?

    That makes you the all knowing?

    How does that apply to a G5 period?!?

     

    In the words of The Who, Townscend and Daltrey, "Who the f*** are you?".......

  • 17. Re: powermac g5 memory problems
    Jacumba Level 4 Level 4 (2,325 points)

    japamac, I'll work with you on resolving the G5 problem you are very good at posting information that you look up on the internet. My expierence is actually working with the hardware and I made a very informative post with my first one.

     

    I believe the hard drive is going bad. The symptoms are certainly there. I don't want to tell someone to just go out and buy a HD for a 9 year old computer. Or purchase ram as you suggested. Or pull the heat sink from the cpu and replace thermal paste. Failing electronics of a old computer is a tough call.

     

    I'd now suggest something simple like checking the pram battery. This can cause the start-up problems that the computer has expierenced. Then move on from there. So far it appears the ram is good. The fans are running so the power supply is working.. So if you have anything useful to offer please do. You may be rated high in this forum but you don't impress me at all.

  • 18. Re: powermac g5 memory problems
    ~Bee Level 7 Level 7 (30,770 points)

    I do not think that it is the memory modules which are faulty.

     

    japamac has been trying to tell you the answer.  There is a serious problem with your RAM sticks.  Either there's a miss-match between two sticks that are supposed to match, or one or more has gone bad or loose.

     

    The Memtest is straight-forward.  In fact, it is unusually strong in pointing out a problem. There's something really wrong with your RAM!

     

    One or more DIMM address lines are non-functional.

    Japamac is a long-time expert volunteer here,  earning over 23,000 thank you or solved points from Original Posters of questions.  You can take his recommendations to the bank.


  • 19. Re: powermac g5 memory problems
    Ronda Wilson Level 8 Level 8 (40,690 points)

    Nobody here has asked you the capacity of the hard drive and how much space remains available on it.

     

    http://www.thexlab.com/faqs/lackofram.html

     

    I agree that it's more likely to be a RAM problem, but checking out the hard drive space would be a good idea, too.

  • 20. Re: powermac g5 memory problems
    japamac Level 7 Level 7 (24,390 points)

    but you don't impress me at all.

    It's a good thing that I could care less about how you feel.

     

    you are very good at posting information that you look up on the internet.

    You mistake substantiating my claims and verifying my experience with the experiences of others who care to post on the internet as mere "looking up".

     

    You should realize that ones opinion means much more when it is shared by and confirmed by others.

     

    That is the difference between hearsay and fact.

     

    Right now, you are completely missing the meaning of the failed POST and discounting the report given by Memtest.

     

    But, I 'spose that you know better than all those that came before you, those that develop the test software, and those that have bothered to get their hands dirty with their own and others machines.

     

    As well, once you get off your high horse and start acting other than the rear portion of that same animal, maybe your information will be given more creedance.

    My expierence is actually working with the hardware

    Yet you ignore the failed POST, the historically documented cases of failed BGA on the memory controller and the related symptoms of such, the report offered by Memtest verifying that memory function is abnormal and the historical issues of failed G5 logic boards which present as memory issues...

     

    Good luck to the OP......

  • 21. Re: powermac g5 memory problems
    Jacumba Level 4 Level 4 (2,325 points)

    japamac, would you please start another post if you just want to rant at me. It is taking away from this post and to the person that is seeking useful information. I would hope the moderator of this forum would delete these off topic post by japamac that are directed at me and serving no useful purpose, other than a distraction to everyone.  Jacumba

  • 22. Re: powermac g5 memory problems
    Robert Albury Level 1 Level 1 (80 points)

    Dear All

    please do not flame and cast aspersions on each other. Life is too short and I value all the suggestions no matter how strange they might appear to others.

     

    It is clearly difficult to diagnose a fault from a distance and the fault with my G5 appears to be not that straight forward.

     

    I am happy to spend time trying to discover a solution as this is my first mac to appear to have fallen over. I started with a 128 Mac in 84 – possibly one of the first in the UK and I still have all the macs I have had over the years although not used actively if at all.

     

    Let me for clarity describe again the sequence of events and the symptoms.

     

    It began when the G5 refused to boot. There appeared to be nothing happening. Of course this naturally occurred at the worst time when I had to finish something. So I took it in to my local dealer and hired an iMac and left it for repair. (Helpfully they told ne that since Apple has declared the Power Mac G5 as obsolete that if it required parts they could do nothing.)

     

    A few days later they said that it was fine – just a failed memory module. So I collected it (two memory modules had been removed) and yea it booted and ran. But after a few hours it froze.

     

    It was only then when I tried to reboot it that I noticed the flashing LED. So I began the process of removing ram. (yes in pairs). Each time if I swapped ram around I could get the G5 to reboot.

     

    So after posting here for help I have done a number of things.

     

    I have looked at the possibility of renewing the thermal paste on the cpu and dismissed it as beyond my capabilities. I have also, when the G5 is running, monitored the cpu temp and it appears to be perfectly normal.

     

    I have run an onyx/Smart check on the hard disk and it reports that it doesn’t appear to have any faults. I do not plan to put another hard disk in as firstly I do not have one, which will fit, and secondly I might as well buy another G5 instead. I would prefer to get this one working if one for sentimental reasons. (In answer to Ronda’s question about the disk capacity – it is the original 149 gb with 115.92 gb used and 33.12 available. I doubt that it would be a virtual memory problem as it hasn’t been required to do any heavyweight processing recently.)

     

    I have now looked at the pram battery and surprisingly for a battery in use for 8 years it is in very good condition. Still measuring almost full voltage.

     

    So yes we are probably back with the memory modules. There are eight – original two pairs of 512 and two pairs of more recent I GB.

     

    At the moment I am going through the memory modules to try and isolate if one of them is bad. The problem is that when I ran memtest the first time I got the results which are above in the discussion which indicate bad memory – but subsequently all the tests I have run has given the result “all tests passed” but in spite of this when the modules has ‘passed’ the G5 will not reboot after shutdown or wakeup after sleep.

     

    When attempting then to reboot there is the 3-flashing LED.

     

    The problem though is that in trying out the different memory modules – the results are inconsistent. A pair of 256 might work in the morning with an ok memtest but not later in the afternoon.

     

    There is a new recent problem – I can get it to boot but then when it is supposedly finished booting it freezes almost immediately.

  • 23. Re: powermac g5 memory problems
    Jacumba Level 4 Level 4 (2,325 points)

    Robert, didn't that computer come with a Apple Hardware Test CD, for diagnosing hardware problems? I have one with the software package I bought from Apple. Is it worth running it? I don't know how good it is, but Apple did go through the trouble of putting them out.

     

    http://www.brighthub.com/computing/mac-platform/articles/48769.aspx

  • 24. Re: powermac g5 memory problems
    Jacumba Level 4 Level 4 (2,325 points)

    I remembered something I thought I'd pass on to you, about the first time I seen a hard drive go bad. The computer was having problems so I decided to defragment the HD. Several times I tryed and it wouldn't defrag which I thought was kind of odd. It wasn't till later that I heard a odd sound coming from the HD.

    The thing that stood out to me in your first post was freezing up with the "raspy sound". My very first thought was I bet it's the HD cause of the sound with the freezing.

    In your last post you now mention it freezes almost immediately. That's another indication, once a HD starts to go bad it progresses very quickly, it goes downhill real fast. LOL

    Where is the raspy sound coming from?

     

    http://datacent.com/hard_drive_sounds.php

  • 25. Re: powermac g5 memory problems
    Robert Albury Level 1 Level 1 (80 points)

    Thanks Jacumba,

    I think after yesterday I agree that the hard disk is failing/failed. After yesterday when the G5 froze after startup it began to be clear that the hard disk was a problem.

     

     

    Sadly we may never know because the G5 seems to have given up. It will not go pass the 3-flash LED no matter what I do with the memory modules.

     

     

    I do not believe that 8 memory modules should all fail around the same time (different age modules) so either plugging/unplugging them has damaged them or the board they are mounted on has failed in some way. It had been suggested that it might be the solder joints but I had understood that that would manifest symptoms as the board warmed up, hence hair dryers.

     

     

    So I think that sadly it is now time for the G5 to progress to the recycling centre and reincarnate as a whole family of mini pads, or maybe there might be some demand somewhere for it to be cannibalised for spares.

     

     

    Thank you to everyone for their suggestions and help.

     

     

    Best wishes to all.

     

     

    Robert

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