To be honest, i have seen that many raid controller card dont work on Intel desktop boards.
Anyway, Intel has not validated any raid controller card on the Intel Desktop Boards.
I remembered to have used a raid controller card on DG43NB and it worked fine, when i have used on another intel board, it did not work.
So if your SCSI card does not work on the board ,try it on another non-intel board if possible to see if it works or not. Then you can be sure that it is due to incompatibility between the intel board and your scsi card.
All the best,
I have a similar problem with this board using a PCI Dawicontrol DC-3410 RAID controller. The RAID BIOS does initialize successfully and the boad BIOS and also the boot menu show the drives connected to the RAID controller correctly, but I'm unable to boot from any device (CD/HDD/...) while any disk is connected to the RAID controller. Is this an incompatibility beteween the board and the controler card? Why does the board BIOS detect the drives correctly?
My board's BIOS version is the original 0069; may it help to update to the latest version?
My RAID controller also supports a Silicon Image RAID BIOS instead of the Dawicontrol one; would this maybe fix the problem?