Yanking stuff and messing around on the mobo at this point is not recommended. The CPU works (Num Lock). Power is good (green). Memory is good (no red).
Yanking cables and unmounting and remounting components on the mobo at this point could easily make things worse. First try checking the simple stuff like video inputs and cables.
Right. Had done, and with respect to the video: Same VGA cable, same VGA monitor, swapped to VGA output of my ol' laptop, works fine. For the HDMI output, using a 2nd monitor with a HDMI input, same HDMI cable, same (2nd) monitor, swapped to VGA output of my ol' laptop, works fine. The one thing I haven't tried is the DVI outputs. I'll have to borrow a monitor for that.