I put my old drive into my new xbox 360 and it wont play the games.

Hi all, hope someone can help me, had an old xbox 360 with the toshiba/samsung ts-h943 drive that worked. got a new xbox 360 mobo without drive put my old drive which works on the new mobo and it wont play games put it turns on and my old dash board comes on have my old hdd memory but when i put the game in i get the white screen that says insert disk. what do i do to get the old dvd drive to work with the new mobo. im a noobie so i dont have a clue. hope someone can help.