Waiting several minutes before removing power, and several more before
reapplying power, changed nothing.

I tried the whole procedure again (transfer Jessie to card, boot), only
this time I did an update | upgrade before shutting down, then
"sudo shutdown -h now" and killed power. When I powered-up the next
time, I noticed that the green LED kept flashing about once every two
seconds. Thinking that the Pi might actually be alive, even though there
was absolutely no activity on the monitor (it hadn't even come out of
standby), I typed "sudo shutdown -r now".

That worked! The monitor came out of standby and the Pi rebooted
normally. At least now I know that the Pi is actually booting.
Apparently for some reason the HDMI driver is not launching upon initial
boot, but is launching upon reboot.

--- SoupGate-Win32 v1.05