Vista Ultimate will not boot without CD\DVD - Lajayce

I have built a new computer:

ASUS M2N E SLI
AMD FX 5400
2GB RAM
2 Hitachi 250G HDD in RAID 0 Stripe Array

Installed Ultimate without any apparent problems.  After complete, realized
that computer will not boot up without a Windows CD/DVD in drive.

Deleted partitions, array, and tried different nVidia RAID drivers, and am
getting same results.

Finally tried installing XP Pro, and I gett the same result.  If a Windoows
CD is not in the drive during boot, I will get the NO SYSTEM DETECTED error.
This would indicate to me the problem is not with Windows, but probably
related to either drive or RAID drivers, but I am at a loss.

Can anyone provide some insight or direction?
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Because I Can