so, you have a new hdd that's currently configured and running w/ your old mainboard, right? and you have a new mainboard that you haven't setup yet, right? are you wanting to pair your new HDD (that's currently up and running w/ the old mainboard) w/ the new mainboard? if so, you're gonna have to back up the data on the new HDD, hook it up to the new mainboard and reinstall the OS; changing mainboards isn't like switching out a CDROM or floppy or something.. you can't just switch mainboards/HDDs all willy-nilly. :Q