Sigh.. more dell models, more problems..

Anyway, trying to set up a new image on the 755's. my existing image will only boot on the 755 if I go into the BIOS and change the SATA operation from RAID/AHCI to RAID/ATA. I have all the right (i think) drivers in my sysprep add-on image, there are no errors in device manager. and have even tried re-downloading and re-installing the Intel Matrix Storage driver. I'm still not able to boot with the default RAID/AHCI. The Windows XP startup screen moves for a few seconds, then the pc reboots itself.

Any ideas here so I can use an image without having to mess with the bios?