My Hard drive has stopped working. it is a 120gb Seagate Momentus 5400.3. It is detected by the bios but the pc wont boot if i have it connected. When i run a DPS-self test, i get a completion code 7 sayin faulty disk. I have looked this up and only part of the disk is faulty. How can i acces and find the faulty section? I cannot detect the disk if the computer is already booted.