Could you please offer opinions as to why the following is happening.
Bought a Samsung 850 Pro to replace current HDD. Cloning went fairly smoothly using Partition Magic. Samsung software stalled at 17%.
New drive wouldn't boot showing the following message saying 'A required device isn't connected or can't be accessed' with error code 0xc0000225.
Booted in to recovery console from memory stick and ran startup repair but no luck. A quick search online suggested enabling legacy support so I did and it worked. Mostly.
Now it will occasionally just show a blank screen after Lenovo splash screen. The drive light will be flashing all the time.
Only way I've found to get it booting in to Windows 10 again is to disable legacy support then enable it again. But it's been ten years since I had any real interest in computers beyond photo editing and have no idea why this works...
Laptop is a Lenono Y50-70 if that is relevant.
Please help 

