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  1. #1
    PowerMac blinking light
    mknabster's Avatar
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    May 22, 2007
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    Specs:
    15in MBP 2.5GHz Core2Duo | 1.83Ghz Dual G5 PowerMac | 2.0 GHz Dual G5 PowerMac
    PowerMac blinking light
    I went to check out what kind of RAM I have in my G5, and it seemed as if one wasn't seated properly, so I took them out and reseated them all. Now When I boot up, the motherboard has a red light on it, and the light above the power button blinks twice. At this point, I have reseated them all 3x, and it's still happening. What's going on?
    -Matt

  2. #2
    PowerMac blinking light
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
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    Nambucca Heads Australia
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    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    The blinking light indicates failed or improperly fitted memory. G5's can be fussy about matched pairs of memory. If all else fails and you have the original install discs, run Apple Hardware Test if you can get it top boot from the disc, which checks out the memory modules.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  3. #3
    PowerMac blinking light
    mknabster's Avatar
    Member Since
    May 22, 2007
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    894
    Specs:
    15in MBP 2.5GHz Core2Duo | 1.83Ghz Dual G5 PowerMac | 2.0 GHz Dual G5 PowerMac
    now how would i boot onto the hardware discs since i can't get the computer to show the apple logo?
    -Matt

  4. #4
    PowerMac blinking light
    mknabster's Avatar
    Member Since
    May 22, 2007
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    894
    Specs:
    15in MBP 2.5GHz Core2Duo | 1.83Ghz Dual G5 PowerMac | 2.0 GHz Dual G5 PowerMac
    Ok, thought I would give an update to the situation. I went into work, and borrowed 4 sticks of 512MB RAM, and it turns out that with them in, it will boot just fine. So problem solved in terms of that, but herein lies another issue, the computer is only reading 1.5GB, not 2 like it should. Does this mean that the slots could be working at half capacity, or maybe the motherboard battery is dead? I'm asking about the battery because when I booted it up, an error came up saying the time has been reset back to a really old date.
    -Matt

  5. #5
    PowerMac blinking light
    chscag's Avatar
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    Jan 23, 2008
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    Fort Worth, Texas
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    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    You probably need to change the PRAM battery. It's likely that's what is causing the memory to not be read properly and of course the system time gets reset on every boot up. Here's a LINK where you can buy a new PRAM battery.

  6. #6
    PowerMac blinking light
    mknabster's Avatar
    Member Since
    May 22, 2007
    Posts
    894
    Specs:
    15in MBP 2.5GHz Core2Duo | 1.83Ghz Dual G5 PowerMac | 2.0 GHz Dual G5 PowerMac
    Ok good, at least it's nothing too expensive. Thanks for the link
    -Matt

  7. #7
    PowerMac blinking light
    mknabster's Avatar
    Member Since
    May 22, 2007
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    Specs:
    15in MBP 2.5GHz Core2Duo | 1.83Ghz Dual G5 PowerMac | 2.0 GHz Dual G5 PowerMac
    Quote Originally Posted by chscag View Post
    You probably need to change the PRAM battery. It's likely that's what is causing the memory to not be read properly and of course the system time gets reset on every boot up. Here's a LINK where you can buy a new PRAM battery.
    You know what, the computer's time is back to normal now, it's not resetting itself anymore, but the full amount of installed RAM still isn't being recognized. So there are 4 512 sticks installed, the first 2 slots are recognizing the full 512s fine, but the other 2 slots are only recognizing half of each stick installed. Could this PRAM battery be doing this?
    -Matt

  8. #8
    PowerMac blinking light
    mknabster's Avatar
    Member Since
    May 22, 2007
    Posts
    894
    Specs:
    15in MBP 2.5GHz Core2Duo | 1.83Ghz Dual G5 PowerMac | 2.0 GHz Dual G5 PowerMac
    Here's a screenshot of what it's reading:



    Now the only difference with the first 2 slots are one is a no name company, and the other is a Samsung, like the other 2 are.
    -Matt

  9. #9
    PowerMac blinking light
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
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    Nambucca Heads Australia
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    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    Not single sided by chance the fiust two, or high density PC memory instead of Mac compatible low density? G5's are very fussy about Mac compatible low density memory.
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

  10. #10
    PowerMac blinking light
    mknabster's Avatar
    Member Since
    May 22, 2007
    Posts
    894
    Specs:
    15in MBP 2.5GHz Core2Duo | 1.83Ghz Dual G5 PowerMac | 2.0 GHz Dual G5 PowerMac
    Yea I really have no clue about either question. From what it looks like, all are double sided though. I would like to purchase 4Gbs for the machine, but this is worrying me about going and spending the $200 on the kit.
    -Matt

  11. #11
    PowerMac blinking light
    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
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    45,245
    Specs:
    27" iMac i5, 3.2 GHz, iPad 3, iPhone 5c, iPhone 6+, 3 iPods, Yosemite
    It looks like the first two sticks are high density modules. Those are not compatible with Macs and will usually give a wrong reading. If you can exchange them for the same type you have in J13 and J14 you'll get the full amount. If you already put in a new PRAM battery, it should be reporting the correct time (which it is) and the amount of memory that the system sees.

  12. #12
    PowerMac blinking light
    harryb2448's Avatar
    Member Since
    Nov 28, 2007
    Location
    Nambucca Heads Australia
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    Specs:
    iMac i5 2.7GHz, 16GB memory, OS 10.10.5
    You should not have to pay that much. If you have the Dual Core, and we are not sure about the model, OWC offers 2 x 1GB at a little over $50.00. You want 4GB so get 4 x 1GB modules. Why? If you purchased 2x2GB and one fails, and you need matched pair, no boot up.

    What memory and graphics does the G5 run - that will help with the model?


    OWC OWC42DDR2PAIR2G 2.0GB Matched Pair (1GB modules... in stock at OWC
    Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!

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