mu33rto's reply assumes OP is correct in using the term "Slave". That may be true, but I've seen too many people who don't understand the term. OP, is this a failure of the second drive on one IDE port and cable? In such systems, the device on the END of the ribbon cable ought to be the one set to Master, and the device in the middle should be the Slave. If that really is what you have, then mu33rto is quite right. Since two drives both seem not to work, it suggests either a faulty ribbon cable or a faulty IDE port on the mobo.
On the other hand, if what you call the "Slave" is just a second HDD in your machine that does not have the OS installed on it to boot from, it is not a Slave. It is just a non-boot drive. In fact, unless you are really dealing with IDE drives, do NOT start moving jumpers on the pins. Jumpers on SATA devices are used for entirely different purposes - there is no Master or Slave for SATA - and changing SATA jumpers can cause you lots of trouble.
So, clarify for me: are you dealing with IDE drives, or not?