Inaccessible boot device error (cloning scsi to IDE)

You would. Your scsi installation uses scsi drivers, so it can't access your ide disk.

It's not easy to clone Windows 2000 between different machines - even different IDE controllers can cause problems. I believe that later versions of Windows are a bit more forgiving in this regard.

Much easier, and safer, to just do a fresh installation, move any data, and reinstall your applications.