My dell optiplex 260 can't recognize a cd-dvd ron or hard drive

CMOS BATTERY MY BE THE PROBLEM.

GO INTO BOID GO TO HARD DRIVE SETTING SELECT NEW HARD DRIVE SEE IF IT WILL REGISTER OR COME UP.
REBOOT SYSTEM.

OR

WHEN THE SYSEM FIRST COMES ON YOU WILL SEE SOME INSTRUCTION FLASH UP ON THE SCREEN PAUSE THE IMAGES OR INFORMATION TO SEE WHAT "F" KEY TO PUSH LIKE F10 FOR A FEW SECOND OR UNTIL YOU HEAR A BEEP NOISE
LET THE COMPUTER FINISH WHAT IT IS DOING AND FOLLOW INSTRUCTION INFORMATION ON HOW TO DO THINGS ARE LIST ON THE BUTTOM OF THE SCREEN AND HOW TO SAVE IT WHEN YOU ARE DONE IT IS USUALLY F10 AND Y FOR YES THAN REBOOT SYSTEM.

ROD

Either the data cable is disconnected from the motherboard (reconnect it), the disk controller on the motherboard is bad (you can buy a disk controller card, or replace the
motherboard) or, least likely, both drives went bad at the same time.