Not much I can do if you are sure everything is compatible.
I downloaded the latest BIOS for your motherboard to reed the "reed me" file.
Under "reason to update" is the following statement:
This update corrects possible black screen issues. Also, bad hard disk error messages are corrected with the updated BIOS.
The BIOS version, description and date is as following:
File Description: Intel (Coryville) 945G, Intel (Council Bluffs) 945G Viiv Motherboard BIOS Update
Driver Part Number: 9537564.exe
Sure you have the latest BIOS?
If yes, then i am out of ideas.