Did you replace the windows 7 hard drive physically with a windows 10 hard drive
or
install windows 10 onto the hard drive that had windows 7 on it?
Simply taking a drive out and replacing it with another drive with a different O/S on it hardly ever works it was exactly the same hardware
Winows 10 has to be installed onto the Harddrive while inserted into the computer. Unless it was an upgrade. Which it seems it was not