Video card not detected in POST on initial boot

Solution 1:

Problem solved.

It seems like something, whether it be the video card or power supply, just needed some time off, literally. I just came back home from 5-day holiday with it off and everything seems to be working and is running just fine at start up.

Some background on what happened. This computer is on almost all day every day. It is off when I am "off" (sleeping) except in those few cases when I need something running overnight. Always had it set up to automatically boot up in the morning up until the POST problem. I'm not sure what caused the problem exactly, but I guess it was a charge problem which needed to be discharged?