Misflash

hi @ all

who can you help me?
when the bios of my dell optiplex gx 280 check the dvd
it stops (the bios) and Doesn’t make a boot.to restart the pc
I have to unplug the ide cable to connect dvd rom to main board.only in this case the pc restart

dvd-rom is a lite on model that it was inside the 5045 dvd play/recr stand alone
bat now i don’t remember what model is…