imac 27" crucial memory upgrade Kernel Panic

Discussion in 'iMac' started by newMacUser2, Feb 29, 2012.

  1. newMacUser2 macrumors newbie

    Joined:
    Feb 29, 2012
    #1
    Hi,

    I upgraded my imac 27" to 12 GB with 2X4 GB crucial RAM. It had original 2X2GB Ram. On startup, I get Kernel panic screen or it takes forever to bring login screen. I was able to login once and could see 12 GB RAM but it crashed again.

    On speaking to crucial, they asked to remove the old/original RAM and try just with new RAM. After removing original (Samsung) RAM & just trying with crucial, it seems to be working fine.

    Is this compatibility issue between new and old RAM, will I not be able to use the original RAM? Can there again be Kernel panic or issues with crucial RAM in future.

    Regards
     
  2. crouch macrumors newbie

    Joined:
    Jan 4, 2012
    #2
    Hi,

    I did the exact same thing as you -- added 8 GB of 2x4 GB Crucial RAM to my 27" iMac -- and didn't have a single kernel panic until I upgraded to Lion 10.7.3. After that, I'd get panics consistently every day-and-a-half. After doing a ton of research for about a week (I was convinced it was 10.7.3, and not my RAM) I finally caved in and removed the 8 GB, and sure enough, the panics went away. After going a week without a single panic, I removed the original RAM, reseated them and reinserted the Crucial RAM. Haven't had a problem since -- and it's been a good week or so.

    My advice: pull out the original RAM, reinsert it firmly, and reinsert the new RAM (firmly) as well, and see what happens.
     
  3. iRebound macrumors regular

    Joined:
    Jun 28, 2010
    Location:
    Chicago, IL
    #3
    My refurbished iMac 27 inch is coming today. I ordered the crucial 8gig ram also. Havent heard anythin like this with crucial ram. Hope this doesn't happen to me!
     
  4. newMacUser2 thread starter macrumors newbie

    Joined:
    Feb 29, 2012
    #4
    Again inserted the original RAM. Looking good so far with 12 GB, I had tried this earlier multiple times but it was crashing. Only difference this time is, I switched the slots for the new and old RAM.
     
  5. newMacUser2 thread starter macrumors newbie

    Joined:
    Feb 29, 2012
    #5
    Kernel Panics every alternate days. Have removed crucial memory. I see iMac has Samsung "Planet First" memory. Should I try this RAM for upgrade?
     
  6. macses, Mar 7, 2012
    Last edited: Mar 7, 2012

    macses macrumors newbie

    Joined:
    Aug 25, 2007
    Location:
    Belgium
    #6
    exactly the same as here.
    now removed crucial ram and trying with original ram alone....
    it's weird because I have this mac finds may 2011 with this configuration: 2x 2GB original ram and 2x8Gb crucial ram without problems.

    2 weeks ago I started having kernel panics and 1 freeze without the kernel panic screen.
    Now typing this with only the original ram in place and doing a men test.
    tomorrow I will try with only the crucial memory in place since that seems to be the cause.

    I was thinking it was something with 10.7.3 because with 10.6 until 10.7.2 never had a single kernel panic.........
     

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