Memory "lost" on wake up

Discussion in 'MacBook Pro' started by jwitte, Oct 16, 2010.

  1. jwitte macrumors newbie

    Jun 4, 2008

    HW: Macbook Pro early 2010

    Since a few weeks my Macbook Pro behaves a bit strange: It boots normally and both of my 2 2GB RAMs show up in "About this Mac" - I see 4GB. When I put the laptop in sleep mode and open it up again, the laptop occasionally doesn't come up again - the display stays black. When I press the power button for some time, the laptop comes back again but from hibernate mode. If I then open up "About this Mac" I just see 2GB. If I reboot, I either get 4 or 2GB - depending on the "mood" of the laptop. My question is: What can be the reason and how can I solve this?

    Thanks in advance
  2. ljonesj macrumors 6502a


    Oct 20, 2009
    Kingsport TN
    is this stock ram that came in the macbook or did you upgrade it yourself you may have to do a pram reset or the other one i cant remember
  3. jwitte thread starter macrumors newbie

    Jun 4, 2008
    Hi ljonesj,

    actually the problem first appeared with the original Apple RAM. I thought it would be an issue with the RAM and replaced it with 2x4GB chips, but the problem persisted. Then I removed one of the 4GB chips and since then the problem did not appear any longer. So it really seems to be a HW issue or? I will nevertheless try the pram reset...

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