Main & external displays switched

Opening and closing the lid on the laptop will change these settings, If you really want things to run smoothly set everything up before you start your presentation.

I would make sure that all power setting's are set to disable all sleep, hibernate, turn off hard drive and screen saver are turned off. You can find all these settings by typing " power " in cortana search box and select "power and sleep settings" then select advanced settings.

Try this, press the Windows Logo key and the P key. Then select PC Only. Then do it again and select Extend. That should put things back to normal. I run triple screens on my desktop and dual on my laptop. I have yet to ever see that happen, not yet anyway.

Weird things can happen if you set your main display to be an external plugged into a laptop. Then boot up with that external display off or disconnected. Windows "should" then set the laptops built in display as Main. It also has to do with the monitor. Some are still detected if plugged in but turned off. Some are MIA if just turned off but still plugged in.

On my desktop PC I run triple monitors. I can boot up with them all off, then turn them on and all is fine. The only time things get changed is if I unplug the video cable to one of them.

On my laptop my second display is USB DisplayLink. If I don't plug the USB cable in my laptop automatically switches to PC Only mode. If it is plugged in on boot up it automatically switches to Extend with my laptops built in screen as Main.

I don't put any tiles on my Desktop. I do everything either from my taskbar or Start Screen. One thing that can happen, either by accident or on purpose, is your Taskbar can be moved from monitor to monitor. I can put mine on any one of my three displays. That will make it look like its the main monitor when its not. Especially if your only displaying your taskbar on one monitor. I display mine on all three, but with all icons only on the main. My secondary diplays only show the Icons for what is running on that display on their taskbars.

giardap said:

Yes, but I don't have my main display the external display - ever. There was no rhyme nor reason for yesterday's glitch. At least it is not screwed up now. Thanks, again.

Yes, I meant to but a "but that's not what you did" or something comment in lol, but forgot. My best guess is your taskbar got moved to the second display somehow. Or it was just one of those Windows WTH moments. At least its back to normal.