Cant make CD-ROM Drive to work with my HDD

Hello,

hey guys . i have Really big prob here , i bought new Giga byte G41 motherboard and now my hard disk WD sata 320 and my CD-ROM Samsung Sata wont work together , i mean the mother can read both of them , but i cant use my CD room ,
it wont work with the wd hard ,

help me plz