T520 dont boot from Samsung 850 EVO

hello,I encountered problem when cloning original HDD to SSD (samsung SSD 850 EVO) on my Lenovo thinkpad T520. First I installed Samsung cloning sw, attached SSD by USB2SATA conventor and then I ran cloning wizard. After cloning operation (with success result) I changed disks and my laptop was unable to boot from SSD drive. It looks exactly like if there is not any OS instaled on it. But if I connect this SSD disk to other computer, it works normally and I can see proper partition structure on it. I thought Samsung sw did incorrect work and I tried to use hardware disk cloning device to copy original disk to SSd once again in raw form. A little longer work, but worth doing in such case. Unfortunately, the result is the same. Laptop refuses to start OS from SSd and is trying to boot from NET instead. After then I tried to clone original disk to spare hybrid SSHD disk and both methods were successful - ie. laptop boots happily from SSHD but it keeps refusing to boot from Samsung SSD 850 EVO. any ideas what to do next? BIOS setting tweak perhaps?thanks in advance

Hi
JirkaT, did you clone entire (!) drive, not partition-by-partition?
I performed the loning process multiple times w/o issues using free version of Acronis True Image Home application. I hope you'e using the same app from Samsung (it has another name I don't remember).
I installed the new target drive into the external USB-SATA box and used cloning application on the "old" source drive installed.

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