Or set it to master. It all depends on the other HD.
If the other HD is a slave u need to set thisone to master. If the other HD is a master, set it to slave. If its cable select, set thisone to cable select also.
Check all cables.
TheMajorMMX - Intel P200 MMX @ 225Mhz - V-Tech (PcPartner) Baby-AT mb w/ Intel Triton TX chipset - Nvidia Riva TNT2 M64 w/ 16MB - 256MB M-Tec SDRAM - Still running.....