Perhaps forcing the BIOS to run autodetect on the IDE channels will help, or a CMOS reset, if the cable swap isn't successful.
Also make sure the optical unit and the HD are jumpered consistently; that is, master for both as they're on different channels. Or, if you use Cable Select, make sure they are jumpered CS and are both on the end connector of their cables.
/RID
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by: subliferPosted on 2008-10-31 at 07:16:46ID: 22850257
The Unknown device in your BIOS is your optical drive. Its fairly rare to happen but your drive has apparently corrupted its firmware or is otherwise not communicating with the bios.
Your best next step is to find a known good IDE cable, maybe the one from your harddrive, replace the one on your optical with the known good cable, power on and go to the bios to see if it is properly detected. If so then your cable is bad (yes it can happen on PCs that haven't been moved and worked fine) if it still shows unknown then the firmware or the controller (on the drive) is toast and you need a new drive.
I hope its just the cable since that is the easiest to resolve.