2012 MBP freezing even on clean install.

Discussion in 'Mac Basics and Help' started by knnthptrsn, Aug 24, 2016.

  1. knnthptrsn macrumors newbie


    Aug 23, 2016
    Hi Guys, I really need your help :)

    I have this 2012 MBP. It was beginning to get slow, so I thought, let's put a SSD in it. I bought a 256GB Samsung EVO 850 to speed things up. Since then all hell has broken loose.

    I replaced the HDD with the SDD and booted up from a USB with El Capitan on it. The install didn't go well an something went wrong. To check if the SSD was working and to eliminate that the USB could be a problem I installed OS X fra Internet Recovery. That worked. Somewhat.

    OS X would run just fine, and then suddenly have a hiccup for a few second and the run fine again for 10 seconds and then another hiccup. It's really unusable :(

    I have enabled TRIM via Cindoris TRIM Enabler.

    I put the old HDD back in an startede up an Internet Recovery to start totally fresh. I used a wired 100 Mbit connection so everything downloaded quick. Put the install took almost 8 (eight) hours! I know a HDD is slow. But it's not that slow. The problem with the hiccups causing the computer to be totally unresponsive for a few seconds to a full minute is still there so it's not the SSD causing the problem.

    The computer turns on and off perfectly and everything seems and looks fine. But it keeps freezing for 5-60 seconds all the time :(

    Please help :)
  2. CoastalOR macrumors 68020


    Jan 19, 2015
    Oregon, USA
    I think you have a failing/marginal internal disk drive SATA cable from the symptoms (a known problem with MBPs). ifixit.com has instructions on how to replace the SATA cable.

    If you want to eliminate the SSD as a possible problem then try using the SSD in a external USB enclosure to see how it performs. If the SSD works OK in the external that would confirm that the internal SATA cable is the problem.
  3. knnthptrsn thread starter macrumors newbie


    Aug 23, 2016
    The SSD seems to work just fine when I boot it up from an USB enclosure. YAY :)

    So I guess I need to get me a nw SATA cable. Thanks for your input. I don't think I would have guessed that myself.
  4. knnthptrsn thread starter macrumors newbie


    Aug 23, 2016
    New cabel installed, and everything works perfectly.

    Thanks again

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