After loads of bother with my 12 month old Tiny computer which had XP Home OS loaded, I was given a hard drive loaded with XP Professional OS which I fitted. I disconnected the original hard drive IDE cable and power lead and connected up the new Drive..When I tried to boot up, it booted up with XP Home until the screen was with filled with data then cut out and restarted, booting up again with XP Home. This carried on in a loop until I switched off. How is this happening?
ArrGee, not strictly true - he advised that he disconnected the original hard disk, where the registry would be stored.
You are correct though - the hard drive was configured on another system so will be confused. There is also the issue of windows activation (I seem to recall this applies to Professsional?) which will tie the O/S to the PC.
You could try stepping through the startup (hit F8 when windows is starting up before logo appears) and choose safe mode.
To be honest this isn't a good way of installing XP on your system - you are better off getting the CD and installing from scratch.
You will have all the drivers from the system that it came out of so even if you do get it to boot windows will detect all of this new hardware load the drivers for it and you will almost certainly get a conflict between MoBo drivers then of course there will be the reactivation because of so much new hardware.