Alright.
Well glad the IP thing worked then ;D
Erm first of all, flash back the virgin dump.
Desolder the DGX and the SD dumper.
Then test if the 360 is still booting (very very small chance it might not work but it's astronomically low if you're careful)
After that you'll want to extract the FCRT.bin from the NAND and use the DVD key + CPU key to emulate the DVD drive.
This I don't know how to set it up but I think the Xkey install guide would point you there ;]
Oh, Also keep a backup of your NAND + CPU Key + DVD key on your computer, back it up twice if you need to.