macbook startup issues

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Dec 14, 2015
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Hi,

Help for macbook pro (non-retina mid 2012).

Recently I started receiving this error in startup: flashing folder with question mark.
I found out that my HDD was malfunction, so i replaced it with SSD.
I reinstalled the OS to the latest (10.11.2) and it seemed to work fine.

When I restarted my computer the folder with the question mark appeared.

I followed a tutorial of how to solve this issue by choosing startup disc at the screen (after you press command + r and power) and I could select the new SSD. The mac restarted fine and I could use it as before. But when I turned it off for the night and restarted it in the morning, the same thing happened. And again I had to use startup disc from that menu.

Sometimes the apple sign appears and it's followed by a prohibition sign. Then I restart to boot manager to use startup disc and it solves it.

Sometimes the mac starts up fine.

P.S. Whenever the mac goes to sleep and I wake it, It takes a very long time to respond. I can see the login screen but nothing is responding for A minute or so. Sometimes even more. Could it be related ?

What could be the problem?

Thanks in advance,
Oz
 

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