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After replacing Hard drive folder with question mark and not recognize it Hi, I have a mid 2012 macbook pro (OSX 10.12.5). Just bought my new Samsung 850 Pro 256gb SSD disc and want to replace with existing HDD. Tried out several methods: I placed my SSD in an external box, connect it through USB- formated everything - Journaled + GUID.

  1. Changed the ribbon cable, the result is the same. To be 100% sure , I bought another SSD with Intel logo on, same the result.
  2. Cloning old hard drive to new - then I replaced it and I got flashing folder. Tried resting PRAM (cmd+option+P+R) - still the same. It did not even recognize it.
  3. I placed the SSD inside my Mac- Then I tried to install from internet - opened Disk Utility - Here it doesn’t show me the hard drive- sometimes it does, but it doesn’t allow me to do anything with.
  4. Thought maybe the cable is broken, but when i reconnect the old hard drive, everyhting works perfectly. Only when I connect the SSD nothing works. If I connect my new SSD through USB, it starts loading to boot, but suddenly a prohibition sign appears, then I disconnect the cable by removing it from the USB plugin, and immiatly reconnect it, the boot loading restarts and I can use my Mac without any problems. Can anyone please help me ?

Do an internet install, here’s how: http://osxdaily.com/2014/12/14/reinstall…

Did you solved this ?. How ? I’m in the same situation as you Thank you. Carlos