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My new G5 is acting funky, need a little help

Discussion in 'Macintosh Computers' started by mojohanna, Jul 30, 2004.

  1. macrumors 6502a


    I need some help. My 1 month old mac is giving me more problems than any of my other macs combined. I have had two instances where the status light on the front flashes 3 times when I turn it on. I hear no start up tone, I don't think it even makes it that far. According to the manual, 3 flashes means incompatible ram. The ram I have is 2x128 factroy installed and 2x256 after market, purchased at the apple store the day I bought the computer (they had a nice deal going).
    First time it happened, I took it back to the store. They of course did not find anything wrong with it. They reset the pmu and pulled the ram and reseated it.
    This happeded to me again earlier in the week and I again reset the pmu along with the pram. Its working fine now.
    My wife uses the computer while I am at work to spend all of my hard earned dollars on eBay, she tells me that today, the fans kicked into high gear, and she got a prompt telling her that she needed to shut the computer down by holding the power button in for 5 seconds.
    I have rebuilt the permissions once and I am planning on doing it again as soon as I am finished here.

    Does anyone have any thoughts or suggestions or should I just take this thing back to the store and let them work it over?

    I have been around macs all my life, so i have a good feel for some of the semi advanced do it/try it yourself stuff.

    Thanks for the help in advance. I am new to this sight and I think I have learned more from reading these threads over the last couple of weeks than I have in the past year!!!!
  2. macrumors member

    Re: My new G5 is acting funky, need a little help

    Try This!!
    Remove the two-256M chips that you bought at the store and try rebooting.
    If the problem goes away, one or both are defective.

    If it doesn't, try removing the two-128M's that originally came installed on your G5 leaving the 256's in.

    Reboot and see if the problem goes away.
  3. macrumors 6502a

    Maxx Power

    Since you mentioned the fans went full blast, and I know the G5's have a design flaw with the cooling of the hard drives.... Maybe it's something inside overheating...
  4. macrumors G4

    Is your third-party RAM listed as compatible with your computer?
  5. macrumors 68000


  6. macrumors 6502a


    Is there any sort of diagnositc program that can be run on ram to check it versus the guess work that goes into using pulling the different sticks? I don't mean to sound lazy, but that was the first thing I thought of the first time it happened and that is exactly what I did.
  7. macrumors 6502a


    Use your hardware test CD.
  8. macrumors 6502a


    I ran the hardware test. Used the extended test option. Nothing came up. Is it normal for the fans to crank all the way up during the hardware test?
    Sounds like it might be software, but that doesn't make sense since nothing boots up when I have the problem. :mad:
  9. macrumors member

    I have yet to find one....other than TechTools Pro.
    I've heard that Apple has a utility that can test RAM, but at best it may be an "urban myth".

    My experience is; RAM that tests OK with TT Pro turned out to be defective. Replacing it with a "KNOWN" good RAM solved the problem.

    SO.....purchase RAM from known sources that allow you to return it if it doesn't work for you even though THEY may test it OK.

    I have used just about evey RAM manufactured out there. The cheap ones are the ones that fail most of the time. The expensive ones (i.e. Kingston, et al) don't fare better than "Apple Branded", "Crucial" or the RAM you can purchase from OWC.

    Also make SURE that the RAM you purchase is the same spec as the RAM that originally came with your Mac.
  10. macrumors member

    Is your video card a 5200?? :mad: See if you can swap that :eek: with another from the Apple Store :p

    Let me know! :confused:
  11. macrumors G4

    As remarkable as it may seem, I can read. Certainly if I had purchased RAM at the Apple Store, I would have ensured that it was compatible with my computer. It is, however, only an assumption that mojohanna did the same thing. And you know what they say happens when you assume?
  12. macrumors 6502a


    To end this part of the discussion the ram is apple labled. Again assuming here, but if apple is going to put their name on it I am sure it would work in my machine
    Here is the list out from the sys profiler:

    Size: 256 MB
    Type: DDR SDRAM
    Speed: PC3200U-30330


    Size: 256 MB
    Type: DDR SDRAM
    Speed: PC3200U-30330


    Size: 128 MB
    Type: DDR SDRAM
    Speed: PC3200U-30330


    Size: 128 MB
    Type: DDR SDRAM
    Speed: PC3200U-30330

    Its all the same speed etc.

    Also, I do have the 5200 card.
  13. macrumors 6502a


    Newer Macs are extremely sensitive to RAM. Just because it is "Apple" RAM doesn't mean that it will perform flawlessly in the hundreds of thousands of computers Apple sells.

    If the RAM/Computer is still new, contact Apple and explain *exactly* what happened, and that it was all "Apple" RAM. They may replace the modules.

    RAM chip manufacturers make many millions of chips every month, its not beyond reason that a very tiny fraction may have issues in the very sensitive Mac computers these days.

    Even 0.1% of all RAM chips produced in a few months is still a huge number, so don't act like this is some huge major flaw that only affects Apple.

    People with problems are orders of magnitudes more vocal about their computer use/issues than perfectly satisfied customers, so the signal-to-noise ration is obviously skewed.

    Contact Apple or go to an Apple store and explain *exactly* the situation i.e. all Apple RAM, 3 flashing lights on startup. They should replace one or more modules until the G5 starts up normally.

    BTW here is some detailed G5 hardware troubleshooting info, including what the power light flashes mean during startup.

    G5 Hardware Help

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