I changed the setting and I don't know how to get the picture back on my monitor.
I went into:
DISPLAY SETTING -> DISPLAY EXPANSION -> ASPECT RATIO OPTIONS -> then switched between "Maintain Aspect Ratio" and "Full Screen (No Border)"
And now my monitor is displaying:
OUT OF RANGE
90.0 kHz / 60 Hz
I also tried "CTRL" "ALT" "F11" as well and that didn't work.
Check wheather the resolution you have set is within the range of the MAX resolution supported by your monitor in your resolution settings. If not set it to the recommended levels.
You may get your problem solved.