Spent 2 hours on this problem this morning. I stripped ALL cables (IDE, power etc...) out totaly. Made sure all boards were in ok and connections all clean, then re-connected all leads back up.
Turned machine on, NOW it has re-configured disks - 2 Hard (C: Main Disk & D: The New storage Disk) & only ONE DVD drive (it has ignored the CD player).
I can still hear the CD player spin every couple of minutes, BUT the PC is no longer freezing.

So where is the problem ?