1. Now you have reflashed the BIOS what is showing on the POST screen? Can you see your HDD displayed?
If not then enter BIOS and set boot devices.
To do this make the first CD make the 2nd boot device SATA if the option is available.If not you have two options: HD0 - If there are no IDE HDs present, or SCSI if you do plan on running an IDE HD as a secondary device.
2. If no good above then BOOt with XP CD in drive and let it run setup watch for the F^ message to load the raid drivers from a floppy they will be on the motherboard CD.