Finally got around to testing different hook ups. The monitor takes both DVI and VGA inputs. The problematic hookup was when DVI>HDMI was in use. I first did VGA>VGA from monitor to laptop...all was well. Then did DVI>HDMI, monitor to laptop, monitor didn't respond. Must be the DVI>HDMI cable. So, I then did VGA>VGA, monitor to desktop, it worked.
Computer opened in safe mode, but then reverted to Normal (before i could touch anything) and finished booting in a normal Welcome screenand...all was well.
This is a perfect example of annecdotal evidence leading one up the wrong tree, eh? Although I still haven't tried out the DVI>HDMI cable on another monitor (will do that later), this cable does seem to be the culprit.
EDIT: Checked out the DVI>HDMI cable on another monitor, didn't wake up, nothing. Obviously the cable, yes?
BTW, I had the initial setup with DVI>HDMI because I thought that I would get better digital picture than if I used VGA...but I really don't know if there is a difference between the two. Is there?
EDIT: Although most say that there is a difference between VGA and DVI, I don't see it on this monitor. But I do think I note that the transfer of data from computer to screen might (not really sure) be a little slower with VGA???