First, I have had a stroke three years ago, thus I am permanently a newbie. I'm sorry.

I have had two monitors about a year, using the proprietary nvidia driver. I WAS using xfce to run my graphical games because when I used compositing on KDE, when I exited the games, the scree was all wonky and I had to restart the computer (via root with ctrl-alt-F1). I installed a plasmoid on KDE named gamemode that would turn off compositing. When I was playing a particular game my game crashed on me and turned off the second monitor, no problem.

However, I cannot boot into my second monitor directly. When I start on KDE, I have only one monitor, and I have to use either the Nvidia-settings or the "systemsettings-display configuration" to get my second monitor. I have both monitors directly using xfce, fluxbox, and openbox, but with KdE it always starts with a single monitor.

I imagine that the problem is in a simple text file, but I cannot change the way KDE has been acting.

I reinstalled the nvidia driver.
I reinstalled all KDE packages.
I reinstalled all xorg packages.

So now I need some advise, since searching via duckduckgo.com has been pointless. Although I think that the problem resides within KDE.

Can anyone help me with this issue?

Did you see this in your searches, and try any of the options?
https://forum.kde.org/viewtopic.php?f=66&t=12010

Yes, I saw that posting on KDE.
My problem is that it WAS working until I started messing with that plasmoid (gamemode) and it only logs into a single monitor on KDE, but I can get dual monitors using either nvidia-settings or display configuration via systemsettings.
So it USED to work just fine, but it is now, sort of, messed up for me.

That's a distinctly kde-settings issue. I have not used kde since version 2.x which was S L O O W. I had it on the occasional live cd and it reminded me of windows vista at it's worst - ages watching hourglasses.

Might I suggest you uninstall the kde second monitor, and grab a walkthrough for adding a monitor?

OK, I fixed it, but I don't know why or how it has been fixed.

I reinstalled the gamemode plasmoid, torned off compositing, and turned compositing on again. It now works and everything is all happy happy joy joy again.

So, I still want to know why it has been fixed. I would imagine that the ruby script had messed up my video setting and when I reinstalled it and turned compositing off then on again it had fixed something that had been misconfigured.

Whatever.

Thank you for your help.