Bios cant find dvd drive

Well basicly i just decided to switch my dvd drive to a new one(the old one was screwy…) and well now the bios cant detect it..
I have put the jumper on master, since i have 2 harddrives set to primary slave/master so that should be right?
If i try and use the old dvd drive again the bios cant find that either, i can remember that i also had this problem when i bought the old one but cant f**** remember what i did to fix it, so well any bright ideas out there?

Ohh yeah sorry for bad english:;)