Philip, further to the questions from Ian, are you able to get back to square one, i.e. If you have a Windows recovery media or the orginal installation media, you could try booting using that media and hopefully that will allow you to fix the problem (cannot give more detailed advice at the moment as it is getting late here in Melbourn Australia. However, in your case it seems a little late for that. Experienced users of True Image recommend creating a backup of the drive, then recovering to the new drive. Unfortunately, as you found with Macrium Reflect 7 things can unexpectedly go wrong when cloning. I assume that you removed the old HDD from the PC, if not all sorts of unpredictable issues can arise. If it uses UEFI then the boot device should be set to Windows Boot Manager not to a specified HDD as you would for BIOS (in this context often referred to a legacy mode). Also, do you know if the PC boots using BIOS or UEFI, as that may help in finding a solution.
To be of assistance, we need more information: What version and build of Windows are you using (for example Windows 10 Pro 64 build 1909).
However, we Acronis users will help whenever we can. Technical support for OEM versions of True Image, which are built to the specifications of the OEM, are supported by the OEM not Acronis: 2201: Support for OEM Versions of Acronis Products.
