Mac Pro not recognizing extra RAM

Discussion in 'Mac Basics and Help' started by bocomo, Oct 1, 2007.

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  1. bocomo, Oct 1, 2007

    bocomo macrumors 6502

    Joined:
    Jun 29, 2007
    Location:
    New York
    #1
    hi gang,

    i just got another 2gigs of ram for my 2.66 mac pro. bought it with the stock 1gb, added a matched pair (2x1gb) and now just added another matched pair (2X1gb). powered up and the computer only recognized the 1gig sticks (all four) but not the orig 2x512. i have placed the ram in the proper slots and made sure they were seated properly but About This Computer has DIMM riser A/DIMM 3 & 4 listed as empty. that is where my 2x512 sticks are. any ideas?

    (the newest ram is being recognized, so that's no prob. my mac just "forgot" about the orig ram i guess)

    thanks
     
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  2. CanadaRAM, Oct 1, 2007

    CanadaRAM macrumors G5

    CanadaRAM

    Joined:
    Oct 11, 2004
    Location:
    On the Left Coast - Victoria BC Canada
    #2
    Do the 512s work in Riser B 3 & 4?
     
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  3. wrxwing, Oct 7, 2007

    wrxwing macrumors newbie

    Joined:
    Jul 13, 2006
    #3
    can anyone help me here also... im having the same problem too... now i having the orginal 512 on top and the new 1gbx2 in the bottom.
     
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