Was that a RAID-0 or RAID-1 array? If you broke a RAID-0 array, you have lost all data, and will need to partition/format/reinstall OS on that drive.
To confirm, is that single Raptor drive recognized in BIOS?
If you pull all drives out of the PC except that single Raptor, and set whatever controller that Raptor is on as second boot device (after the CD-ROM drive first boot device), then you should be able to install OS.