You should find out whether you got the right jumper settings on the back of the hard disk.
If a hard disk is connected on the end of the IDE cable, then it should be set to MASTER. Alternatively, it can be set to cable select.
You can find all these settings if you know the manufacturer of the Hard Drive and the Model number. Go to the manufacturer's website - they usually give a graphical representation of what pins should be closed and opened to provide the setting you want.