Thanks for the reply. I just tried that, but it didn't' work.
I've spend about 20 minutes, playing with the BIOS settings...and I think I have figured out what it is . At some point i remember setting the Intel Processor Graphics memory from the default 64MB to 1024 MB. At some point after that, no video in BIOS to the DVI-D port.
After upgrading to the BIOS F9, I switched the video memory back to 64 MB, just to see. And it worked! I notice when I'm in Dashboard View in the BIOS it only lets me select a memory value up to 448 MB, which will still boot video to the DVI-D port. If I go into Classic mode, I can select up to1024 MB (having the steps for 512, & 1024 available there).
I have set the video memory up, step by step, rebooting each time, back up to 1024MB and I still have working video on the DVI-D port.
Why would that be?