It would seem that only a specific revision of this processor is comparible with this board
check http://processormatch.intel.com/CompDB/SearchResult.aspx?Boardname=DG45ID for more information.
You processors should have a marking SLACR
Actually the board DG45ID is compatible with the CPU Q6600 with the SL Number SLACR, and it needs to have a minimum bios Version 0077.
Note: The cpu Q6600 comes in two different SL Number:
So if you have the one with SL Number SL9UM, it is NOT compatible with any board DG45ID. Now, if your CPU is SLACR and it is not working properly, try to update the bios to the latest version using a different CPU which requires a lower bios version.
Update the bios using the recovery mode:
Read the READ Me file: http://downloadmirror.intel.com/17547/eng/BIOS%20Update%20Readme.pdf
Hope this helps a bit.