iBook won't recognize new RAM

Discussion in 'Macintosh Computers' started by 18thTomorrow, Nov 17, 2004.

  1. 18thTomorrow macrumors 6502

    Apr 5, 2004
    The Alpha Quadrant
    I have a new RAM chip that I just installed, however, my system is not recognizing it. It's an iBook G4 with 256mb built-in, and I just put a 128mb in the so-dimm slot. I can't for the life of me figure out what's wrong. (I'm positive this is the right chip; it came from crucial.com) Your suggestions and help are much appreciated.
  2. Nermal Moderator


    Staff Member

    Dec 7, 2002
    New Zealand
    First, take the memory back out then put it back in. If that doesn't work, try resetting PRAM. If you've never done that before, here's how to do it:

    - Restart the computer
    - As soon as you hear the startup sound, press and hold Cmd-Opt-P-R
    - Release the keys when you hear the sound again

    If that doesn't work, try this:

    - Restart
    - Hold Cmd-Opt-O-F at the startup sound
    - Release them when you get a screen full of text
    - Type these commands:


    This may wipe some settings, but you won't lose any documents or applications.
  3. efoto macrumors 68030

    Nov 16, 2004
    Cloud 9 (-6)
    What Nermal said pretty much sums up what you should start with, although before playing with too many other things, inspect the chip itself for visual defects or other issues. Make sure the contacts of the chip are clean and that there isn't anything that would be preventing good contact between the ram stick and the board. I know it sounds funny, but I have heard this more than one would expect from PC buddies...so check it out.
  4. TLRedhawke macrumors 6502

    Sep 17, 2004
    The usual problem with iBook ram is that it isn't fully inserted. Push the DIMM into the slot, at a 30 degree angle, firmly, until it clicks. This shouldn't be a faint click, but a distinct one. Then, lower it until it clicks past the tabs. This should solve it. If the ram still doesn't work at this point, it is likely defective.

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