When booting up after connecting to the larger screen, LXDE doesn't come up; instead all I see is the desktop with the raspberry. I discovered I could bring up the terminal, and using that I enter "startx" (also tried "sudo startx") but that leads to an error dialog box with the following:
My next step was to issue a "sudo shutdown -r" and see if rebooting helped but no such luck. Next was to do a "sudo shutdown -h" and see what happened. After powering up again, I didn't even get to the normal desktop. Instead, there's a white screen with a taskbar across the top. At the left it says "raspberrypi" and on the right it says "en_US.utf8" (which is good) and a tool symbol with a dropdown selector for Default Xsession, LXDE and Openbox. There's also a power icon at the far right with options to Suspend, Hibernate, Restart or Shutdown.
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GDBus.Error:org.freedesktop. Policy Kit 1. Error. Failed: An authentication agent already exists for the given subject.
Clicking LXDE (or anything else does me no good, because there's an "Enter your password" dialog in the middle of the screen. And it won't accept my password. The first time I ran into this was the day after I'd received the pi, and I had already changed my password. The dialog wouldn't take the new one, and I was cussing myself as an idiot thinking I'd somehow mis-remembered it. I ended up using Noobs to resinstall my operating system and started over.
After that fresh start, I got involved in trying to solve a problem connecting to wifi (self inflicted wound) and decided not to change my password this time until after I'd gotten that settled. So tonight, after finally getting hooked up with my wireless, I decided to celebrate by taking the pi in and hooking up to the big TV. The same exact thing happened as before, including the dialog box not taking my password. This time around I HAVE NOT CHANGED MY PASSWORD. I'm user pi, and should have password raspberry, but the dialog will not accept it. I can't even get to terminal now; basically all I can do is keep entering my password or use the shutdown option.
I should note that before doing the reboot I used my windows laptop to dig up a thread where somebody was getting the same Policy Kit error - see here: viewtopic.php?p=774355#p774355. I took the suggestion in this post: viewtopic.php?p=735697#p735697 to add 'LXDE' to the "NotShownIn" line in /etc/xdg/autostart/lxpolkit.desktop. (I was hoping to avoid the very situation I'm in with that, but no luck.)
I should also mention that once I'm in this loop, returning to the original monitor does me no good - I've still got a password dialog that won't accept the default password, and no way out so far as I can see. I'm very much hoping I won't have to use Noobs to wipe everything and start over again, but that's the way it's looking. I'm headed for bed now, hoping against hope I'll find a solution (or at least some suggestions) in the morning.
The thing that really bugs me is that I know people take their pi's to schools and other places to give demos. I can't imagine they always take their monitors along, so it must be possible to switch to a different monitor. I can't see why that matters anyway, when the pi is just sending out an hdmi signal...