Is it truly stopped, or is there a shell prompt waiting for a login following that message? What messages precede it? Does Ctrl-Alt-F3 produce a shell prompt? Is there a BIOS setting where a selection between legacy and/or AHCI and/or RAID can be made? Did you switch from an Intel CPU or GPU to an AMD GPU or CPU or an NVidia GPU? Did the old one use an installed proprietary graphics driver? Does the new one have a BIOS option CSM deselected? If you provide good hardware information, before and after, there’s a better chance we could offer a solution. Like suse_rasputin, I too often transfer disks among machines with little to no trouble.