Did you try shutting your MBPro power off (press and hold the power button for about 5 seconds), then press and release the power button? Does it boot after you do that power-cycle?
Be sure to give the install process enough time. If you see ANYTHING on the screen, try waiting for 30 minutes before you do anything.
I did do the power cycle steps. Strange thing, when I try the upgrade, everything goes as it should. Appears like everything is working, the usual prompts, etc. Then it gets to a point where the bar gets to about 75%, and then the text appears on the left (looks like code, but it runs too fast to read) this repeats about 3 times or so. Then I get a circle with a line through it, very weird!!! After a while it just goes blank.
[doublepost=1486648390][/doublepost]I will try one more time. I've been using the beta software for several months. No idea why this one won't install. If this one doesn't work, I will wait for the nest and try that one.
I'm trying to think of what changed, or what I could be doing wrong, but it's pretty straight forward so I'm just stumped why it's doing the same thing...
Thanks to all for your patience and kind suggestions.