My computer wont let me run my hd and cd on seperate cables. My hd is my primary master and my cd is a slave. When i unplug the cd rom from the cable it says hd failure and sometimes wont detect it. plug the cd rom back in and ok. It does detect the cd rom on a seperate cable ok HELP

pII 400
abit be6-II 1.0
52x sony cd rom
ata33