Disk drive says,"plays DVD."

Ok I just bought a brand new motherboard for the xbox 360 and I'm using the old disk drive. Now when usually put in a game on my old motherboard it would read and say the game I was about to play but sense I got the new motherboard it just says play game or play DVD even tho I have a game in. Now here's the kicker when I hit the A button to play game it'll load then disconnect me from xbox live and take me straight back to the dashboard. I need help on how to fix this somebody please help.