i bought a samsung 850 evo M.2 250gb ssd for my acer laptop with 2tb hhd to replace with so it will become much faster. i used the samsung data migration software to clone the hhd to the ssd. it completed the cloning and it boot properly even when i remove the hhd. But after a month of using without any problem now it says No Bootable device found. i check the bios it still recognize the ssd. can i still retrieve the files in my ssd? or made it Bootable again?