New drive/vista install stopped booting

[Matt5Frenzy]

Two weeks ago one drive in my raid 0 array (vista 64 boot) began throwing errors, so I installed a 3rd sata drive, nonraid, installed vista 64 and began migrating data/programs. The failing raid array and the new drive were dual booting without issue, typical "choose your OS" screen with every startup.

Today, after finally being content with getting what I needed from the old drives, went into my raid controller and deleted the raid array in preparation to wipe and reformat the old drives. Now, I'm unable to boot from the new drive with vista installed, "disk boot failure... etc" message.
Disconnected everything but new drive, still no luck.
Drive is recognized in bios and first in boot priority.
Tried switching controller from RAID to ACHI mode, no change.
Attempted using different sata ports, including different controller, no change.

MB is a Gigabyte GA-P35-DS4 with an Intel ICH9R controller. Raid array and new drive were both on same controller, along with 2 optical drives. Second controller on MB is a gigabyte sata2 which has always been unused. Rest of setup is in signature. New drive is a 1tb WD caviar black.

Thanks in advance for advice!

[Ubon94]

maybe your dual boot file is on the original hard drive