2 x HP SFF Desktops, one with 4Gb RAM and a newer one with 8. Older runs Win 7 64 bit, newer supplied with Win 10 installed (since removed). Used Paragon HD Manager to migrate OS from old HD to newer one, successfully. Newer HD then plugged into newer PC but cannot get it to run., even using valid W7 disc to boot/repair. I have a nasty feeling that what I intended (upgrade machine by swapping hard drives) doesn't fit in with Microsoft's 'business plan'!!
Can anyone confirm that I'm wasting my time (and money! ) or suggest how I can manage the HD swap, please?
TIA