Try running fdisk /mbr at the command prompt and/or boot from a floppy created from the same version of windows then running sys c: from the A:> prompt and/or run regedit then search for noide and delete the key if it is found. The noide one is a bit strange. Windows if it has a problem with the secondary IDE controller it sets this flag that tells it to ignore the secondary IDE for the rest of eternity.
Hope this helps
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