DVD drive will only recognise cd's

Hi everyone ,

 I'm hoping that someone here can help me. I have a Lite-on 48161h combo dvd/cd drive and until the last couple of days it was working fine.  A computer place installed a new motherboard and had to reinstall windows XP and now, even though the drive says it is a dvd/cd-rw drive it only wants to play cd's. I've tried dvd's that I've burnt myself , actual dvd movies and a data dvd - all with the same result - the drive just spins and spins and spins with the light flashing at the same rate . I have a Iomega dual dvd drive installed as well and it still works okay.  Has anyone got any ideas ?
 Adam