Ram problem

Discussion in 'Mac Basics and Help' started by showmehost, Jan 14, 2008.

  1. showmehost macrumors newbie

    Jan 14, 2008
    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)

    JW Patterson
    Auto Professionals LLC
    Kansas City, MO.
  2. Makosuke macrumors 603

    Aug 15, 2001
    The Cool Part of CA, USA
    First things to try would be:

    What happens if you remove the RAM you just installed--do the 512s reappear?

    What happens if you move the 512s to another pair of slots (say, swap with one of the other pairs)?

    Those will point to whether it's a problem (coincidental?) with the RAM itself, with the slots, or with those sticks not liking to play nice with the new ones.

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