New system...at first power on, I thought was no POST, so I rechecked everything, finally including a different monitor, this time attached to d-sub rather than dvi. Everything then worked, installed Win7, drivers, etc.
HOWEVER, when I change back to my good monitor on the DVI port I see nothing (i.e. the initial problem). I have done a "battery out" CMOS reset and reloaded optimized defaults. Didn't fix. Didn't think I should have to, but I also changed the "IGX configuration Onboard VGA output connect" from "Auto" to "D-SUB/DVI" and changed "Init Dispaly First" from "PCI Slot" to "OnChipVGA". Still no DVI output.
If I hook both monitors up, Windows only sees the one connected to the d-sub (as I would expect, since BIOS setup won't output to DVI port)
I hope there's something about the excitement of a new system that's causing me to loose my mind and overlook something. Any help would be greatly appreciated.