If you still have your USB install flash drive (and you should), and you used the NBM/NBI method, boot from that as if you were going to do a fresh install, but select NBI from the Utilities menu and run it again, including Generate Custom DSDT.aml file.
Re-boot and you should be good to go.
Just as a side note, if you would edit your signature with your machine specs, it makes it easier to offer help. NBI or DellEFI, it makes a difference as far as giving you the proper advice.
Mini 9 | OS X 10.6.7 | NBI 20100616212351| BIOS 05 | 32 GB Runcore | 2 GIGS RAM
10V | OS X 10.6.7 | NBI 20100616212351 |BIOS 06|160 GB|1 GIG RAM| 6 Cell Dell Battery
Back up Mini 9| OS X 10.6.7| NBI 20100616212351| BIOS 05 | 32 GB SuperTalent | 2 GIGS RAM