Moved HDD with Windows 8.1 to new CPU/MOBO. Now no boot.

Hello. First time building a pc. I completed build (asrock extreme4 MOBO, I5 4670k,) Using the HDD from an asus prebuilt comp (with an amd A85500 cpu) external boot went well and all hard where works fine. Like a newbie does i didn't research about moving the OS on a hdd. I didn't uninstall drivers or create a repair image or anything at all. Just plugged in the hdd and booted of course now the OS wont boot properly. Any advice on how to fix this would be greatly appreciated.

The system is too different and drivers for it are not installed, If you have windows boot disk you can try Repair from it but if it's an OEM you are going to run into activation problems.

Like CountMike said, even if you managed to make the OS running on new MoBo, activation will be a problem. OEM licence is tied to the system in which it is pre-installed and the license is not transferable. On the other hand, retail version can be reactivated ( may need to call Microsoft support ).

No, you can not transfer the OS to a new PC, as this is a OEM manufacturer's PC licence.

Microsoft said:

Can I transfer the software to another user? You may transfer the software directly to another user, only with the licensed computer. The transfer must include the software, proof of purchase, and, if provided with the computer, an authentic Windows label such as the certificate of authenticity label including the product key. You may not keep any copies of the software or any earlier version. Before any permitted transfer, the other party must agree that this agreement applies to the transfer and use of the software.

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