Manjaro repeating install after installation

I installed from iso. I rebooted once it was all good. I changed vbox take screenshot key to host(right ctrl) + f12. And tried to take screenshot. Bom! Suddenly the screen gone black. I figured it didnt changed. So i check out the setting but didnt find what is alt+f12 doing.

So i shutdown and tried to launch again. Its all brand new OS. Than i unplug the iso. Take vdi from Controller SATA to Controller IDE. And know only remember my user and 1920x1080 screen. No firefox history or installs nor dekstop files.

Sounds like you had a stroke.

It was a fresh install but im afraid to repeat it again. And boot was 10-20 seconds take to boot but now its a minute and no boot screen.