Ah BenQ went sideways

See what happened to my Ah BenQ yesterday. I stepped out of the room for one minute and came back to this. Niamah, wtf. Lucky it's still 5pm plus when that happened. I called the technician who taught me how to fix it over the phone. I happened again this morning when i turned it on. I remembered the steps and tweaked it back. Dont know what happened that turned the screen to a 90 degrees. So long as it doesnt rotate again, i'm happy. Nobody gets blamed.