iMac 21.5" RAM upgrade, now three beeps

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  • survivalbloke
    Badcaps Veteran
    • Aug 2021
    • 286
    • United States

    #1

    iMac 21.5" RAM upgrade, now three beeps

    Hey, got a 21.5" imac A1418 14,3. customer supplied ram upgrade but we get the three beeps indicating RAM problem. We then bought ram from OWC which is where we normally get mac ram, but same problem, the three beeps. CMOS battery was 2.88v, so we replaced. I've done many ram upgrades in these, and not sure what's going on. Any insight?
  • reformatt
    Badcaps Legend
    • Feb 2020
    • 1403
    • Australia

    #2
    Re: iMac 21.5" RAM upgrade, now three beeps

    Disconnect the headphone jack. Seen a shorted cap on this board across a 3.3V supply caused this problem for me.

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    • survivalbloke
      Badcaps Veteran
      • Aug 2021
      • 286
      • United States

      #3
      Re: iMac 21.5" RAM upgrade, now three beeps

      Originally posted by reformatt
      Disconnect the headphone jack. Seen a shorted cap on this board across a 3.3V supply caused this problem for me.
      Thank you - unfortunately, it isn't working.

      Comment

      • RJARRRPCGP
        Badcaps Legend
        • Jul 2004
        • 6304
        • USA

        #4
        Re: iMac 21.5" RAM upgrade, now three beeps

        Originally posted by survivalbloke
        Hey, got a 21.5" imac A1418 14,3. customer supplied ram upgrade but we get the three beeps indicating RAM problem. We then bought ram from OWC which is where we normally get mac ram, but same problem, the three beeps. CMOS battery was 2.88v, so we replaced. I've done many ram upgrades in these, and not sure what's going on. Any insight?
        1 long-2 short bleeps? Take out the RAM and reinsert the RAM.
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        • reformatt
          Badcaps Legend
          • Feb 2020
          • 1403
          • Australia

          #5
          Re: iMac 21.5" RAM upgrade, now three beeps

          If you are inserting known working RAM then you need to go through all the switched power rails to see if they are present. Some are often shorted like the headphone jack I mentioned earlier. Also check the pins of each RAM socket as well for debris or loose pins etc.

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