|I was able to get the monitor working by plugging it into the second DVI slot on the video card. It was detecting as the secondary monitor during boot even though there was no other monitor plugged in.|
I'm running a 3-4 year old motherboard and the CMOS battery is a good idea. I just found that the HD priority change is actually a full BIOS setting reset. The motherboard is an eVGA 680i LT SLI.
My next steps will be updating the BIOS version and getting a new CMOS battery.
I do have one other weird, phantom sort of issue. Which is, while the computer is powered down and the monitor is turned off, the monitor will turn itself on randomly 2-3 hours after it was shut off. Very strange.
edit: Monitor is a Viewsonic VX2835WM