OK....I feel kind of foolish
I figured out what it was (the issue causing the problem of no Blu-ray playback) and I fixed it.
Kind of simple, really.
I almost wish that it had turned out to be something complicated and involved, so that
that way, I could have gone, "Dang! I
never would have thought of that!"
Yes, it was a driver thing. But, not a driver I would have thought of, or, at the least, that it would have been taken care of during the Windows 8 installation I just did recently.
My monitor. My Samsung HD monitor. It, too, has drivers. I didn't catch this at first in Device Manager, but my monitor was showing up as a "Generic" device.
I installed the drivers (chose "digital" during the install, not "analog"), popped in a Blu-ray disc.....
and it played.
I knew my graphics card and drivers were solid and good to go (GTX 770 with latest updated drivers), and I knew my monitor was HD, plus, I had watched Blu-rays on it before, before I had done this new system build.
Didn't remember the monitor's drivers, though. Duh.
Thanks for all the suggestions anyway, though; I always get great feedback and info here!!
Pez