Ssd can't boot from mainbay folder with question mark

Hello I've searched for my problem but can't find anything same so I'm gona ask.
first of all I'm sorry for my English.
I'm using MacBook pro mid 2012 with samsung 840 evo ssd 500gb.
today it was working perfect it felt asleep and after wake up it restarted and flashing folder with question mark appeared on screen.
I Know it's some kind of hdd problem. So I've took it out and put in external box to connect to my friends MacBook to see if it's working and does all information is still in it. It was working perfectly. after that I connected it via usb and boot it by holding opt key and it startups normal. To check that it isint sata cable I have puted empty hdd in main bay and booted from ssd connected by usb and both drives show up in disk utility.
So hdd working perfect. Sata cable is good and can read drive.
Macbook boots from ssd connected by usb without any problems.
The only problem is that I can't boot my MacBook from ssd in mainbay it shows flashing folder with question mark.
Maybe anyone had had that issue before.?
How can I solve this problem.?
again sorry for my English. And thank you for all your answers.

Do not apologize for your English. I assure you your English is better than what my facility with your language may be.
I have seen a couple of posts similar to yours where the SSD will not boot internally but a conventional HDD will. The resolution in one case was a new SATA cable even though the tests suggested otherwise.
I would take the MBP to an apple store and have them check it thoroughly and see if they can pinpoint to the cable as the problem. Obviously this just a guess on my part.
A call to Samsung technical support may also be a good idea.
Ciao.

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