RAM missing

Discussion in 'iMac' started by cschmelz, Oct 9, 2010.

  1. cschmelz macrumors 6502

    Jun 6, 2007
    So I have had my 27" i7 (July 2010) for about a month. On initial install the RAM showed 12gb (which is correct). I had the stock 4 GB and then added 2 4GB chips from OWC. They displayed correctly.

    Now, suddenly am showing 6GB. Bank 0 DIMM 0 empty, Bank 1/DIMM 1 2gb, Bank 0 Dimm 1 Empty, Bank 1 Dimm 1 4gb.


    Reseat all and try again? Seems an odd failure. Bank 0 give up the ghost? Just seems really odd both factory and add in ram suddenly failed...
  2. 87vert macrumors 6502


    Oct 7, 2008
    Pittsburgh, PA
    try reseating the modules and reset the PRAM.
  3. cschmelz thread starter macrumors 6502

    Jun 6, 2007
    Tried both... Fail!

    Still only showing the 6gb....Arghhhh
  4. MacHamster68 macrumors 68040


    Sep 17, 2009
    could be a simple as some of your ram is gone bad , try swapping them between slots , but make notes where every module was and then you will find out if ts the ram itself or the ram slots ,if you find its the ram return it to owc if the slots are dodgy return it to apple as faulty
  5. cschmelz thread starter macrumors 6502

    Jun 6, 2007
    Interestingly swapped out Apple RAM and put in only OWC RAM and machine repeatedly kernal panic'ed. Removing OWC RAM and putting in Apple RAM results in stable machine.

    Weird that problem was active yet it passed both extended hardware tests AND Memtest 4.22 runs but OWC add in RAM appears to be faulty.

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