My computer is unable to identify all other d

Hello,
My first problem is that whenever I turn on my computer on,it only detects the master
hard drive ignoring the enslaved hard drives together with the other two CD-drives.Certain times
it will identify non of them and sometimes wil identify Master Hard drive and enslaved Hard drive
leaving other CD-drives and in the cause of using only the Master hard drive it will hault in the
middle of operation with a blue screen display that windows has to end to prevent damage to
hard disk.
This really disturbs me because this problem normally happens when I need the computer the most.
Again when an external hard disk is inserted into the USB slot,my computer will give a sound but will not be I
identified at my computer.
Please help me resolve this plobem