I am sorry to hear you are having problems with the system but let me help you.
It is important to say that when changing a HDD with the OS installed on it to a different board (not the same model) the chipset may not recognize the HDD.
I recommend you connecting the HDD to the board you were using, save the information and do a clean install of the OS with the new board to make sure everything will be working fine.
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your change motherboard but you didnt format it on the motherboard that you are using now? it might not continue to the desktop or Os might corrupt.. try to format your HDD in your new motherbord