hard drive not recognized

Hello,

I INSTALLED A 40GB INTERNAL HARD DRIFE, SET IT UP AS SLAVE AND SET THE OTHER HARD DRIVE AS MASTER. THE DEVICE MANAGER RECOGNIZEES THE NEW DRIVE, HOWEVER, WHEN CLICK ON START AND THEN OBN COMPUTER, THE NEW HARD DRIVE IS NOT DISPLAYED. wHAT CAN I DO TO FIX THE PROBLEM?'

THANKS FOR YOUR ANSWERS,

RANDY LEMENS