6 Replies Latest reply: Apr 25, 2012 5:07 PM by Allan Jones
Wiv Level 2 Level 2 (155 points)

Hello Folks,

 

I have just tried to install 2 x 1G RAM sticks in my old iMac to replace the previous sticks in there (a 512 and a 256). 

Everything worked okay, just slow, with the old RAM of course. 

After install of both new sticks - or just one new stick and an empty slot - machine cannot start up.  Just beeps three times and the fan runs faster than I have ever heard it.  Doesn't find sys startup.

If I reinsert one of the old small RAM sticks and one of the new ones it starts fine, recognizes the old but sees the slot contaning the new RAM as "empty".

I have reinserted all of them numerous times (the old RAM works perfectly each time, the new has not worked yet).

I THINK I got the right specs on the RAM and the Kingston model number (KVR400X64C3A/512) is identical on one of the old 512 sticks and the new 1 G sticks (KVR400X64C3A/1G) - so that seems like they should at least be in the same ballpark.

Any suggestions for getting this RAm to function?  I have pulled RAM in and out of various machines and a few times with this one.

Many thanks for your ideas.

 

Wiv


iMac DV (Slot Loading), Mac OS X (10.5.8)
  • 1. Re: New RAM invisible to the iMac
    Allan Jones Level 7 Level 7 (30,450 points)

    Are you discussing the "iMac DV (Slot Loading)" in your profile. If so, that's the identifier for a G3 iMac and  I've never seen any specs anywhere stating that it can use 1G RAM modules in that model. Even the RAM sites that always tell you when a Mac can take more RAM than the original specs say the G3 slot-loaders are limited to 2 x 512MB modules.

     

    The symptoms you describe certainly fit the issue of the G3 memory controller not recognizing 1G modules.

  • 2. Re: New RAM invisible to the iMac
    Wiv Level 2 Level 2 (155 points)

    Oh... ha ha... had not noticed that the old Candy colored iMac DV was still listed there.  It was in the pull down list of "computers registered to me"

    No.  This is a G5 iMac with a Powermac8,1 processor.  Two RAM slots.  It is from around 2005.  A big white square one.

     

  • 3. Re: New RAM invisible to the iMac
    MGW Level 7 Level 7 (27,000 points)

    In whuch case you have to push the RAM in with more force that you think it could possibly take.  Push and then push harder till you hear the click and the stick has seated itself.

     

     

     

  • 4. Re: New RAM invisible to the iMac
    Allan Jones Level 7 Level 7 (30,450 points)

    Aha! That makes the "10.5.8" now makes sense, too.

     

    Where did you get the RAM? PowerPCs can be RAM finicky, not liking hi-density modules.

     

    Kingston ValueRam has not worked in some Macs but it's usually Intel Macs that struggle.

  • 5. Re: New RAM invisible to the iMac
    Wiv Level 2 Level 2 (155 points)

    Good morning Allan, 

    Indeed, I suspect the RAM modules too. 

    Other threads have mentioned the PowerPCs not always working great with Kingston ValueRAM...

    I went to the Kingston site and entered in the serials for one of them and there is a strong possibility they are counterfeit to boot.  I live in China and this kind of thing is not that uncommon here. 

    If PowerPCs can be RAM finicky... well... it probably likes FAKE ValueRAM even LESS than the real thing.

    Darn good job though - it looks more authentic than the working 512mb stick I am trying to replace.

    Live and learn.  When in the US I usually  get bites and pieces from OWC.  I miss it.

    Thanks for your time and suggestions.

  • 6. Re: New RAM invisible to the iMac
    Allan Jones Level 7 Level 7 (30,450 points)

    I've gotten all my Mac RAM from either OWC or Data Memory Systems for over a decade--good stuff.

     

    I went to the Kingston site and entered in the serials for one of them and there is a strong possibility they are counterfeit to boot

     

    The counterfeit thing never occurred to me. It's really getting out of hand. You can't order from OWC while in China?