Question PC goes black screen after pressing "Only for this pc" button in Projection. (Windows + P)

[Dhdhhsh]

So my pc screen went black after I pressed the "Show only fo this pc" Button in "Projections" (Windows + P) because I had to go outside of my monitor to draw in an open application. I followed a tutorial and my pc went black screen. I tried turning on and off the pc for 10 times and unplugging and replugging. Please help

 

[Dhdhhsh]

So I just clicked the "Only for this pc" in "Projection" Tab (Windows + P) because I had to drag the open applications into my visible pc screen because I do not have a 2nd monitor. I tried restarting and unplug/replug and it still didn't work.
Whenever I restart my pc, I am met with the words "No signal" Please help