Problem with RAM Install on a MacBook Pro 13 in 2009

Discussion in 'MacBook Pro' started by Adamsnw, Jan 27, 2015.

  1. Adamsnw macrumors newbie

    Jan 27, 2015
    Hi - I recently tried to increase my RAM from 2gb to 8gb but when all 8gb are installed it won't power up and beeps three times indicating there is a problem with either the RAM or the install. However when I install a 4gb and one of the original 1gb it works fine. I have tried every combination in every slot and all work except when I install the full 8 gb in either slot. Has anyone else run into this problem? Is it a firmware issue? I am using Crucial 8GB Kit DDR3L-1600 for the 8gb and the original Samsung 8500S RAM.
  2. snaky69 macrumors 603

    Mar 14, 2008
    Your computer should handle 8GB no problem, make sure it has fully updated firmware and try again.

    Else I'd return the RAM and try another pair.
  3. Gjwilly, Jan 27, 2015
    Last edited: Jan 27, 2015

    Gjwilly macrumors 68030

    May 1, 2011
    SF Bay Area
    Your machine can only use PC3-8500.
    When it see the one PC3-8500 chip it knows to downclock the other one.
    When it doesn't see any PC3-8500 it gives an error.
    You'll need to stick with the correct RAM.

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