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모델 A1278, 2012년 6월 출시. Turbo Boost가있는 Intel 프로세서, 최대 512 MB DDR5 비디오 RAM

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After replacing HHD to SSD, Flashing problem accures

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 ?

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Do an internet install, here's how:

http://osxdaily.com/2014/12/14/reinstall...

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I've tried those methods, but as I mentioned before, the disc doesn't appear to make an installation on.

Reformat the drive using the "write zeros" option with Disk Utility.

Will you please explain what "write zero" is and how I can using it?

It's an option when formatting. There's an options box that needs to be opened when selecting your format.

See step #3 here:

https://support.apple.com/kb/PH22241?loc...

If "write zero" means securely erasing of the disc, then I've already done it. I chose "Most secure" option when I was erasing my SSD.

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Did you solved this ?. How ? I'm in the same situation as you

Thank you.

Carlos

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