I accidentally pressed Ctrl + Alt + F8 on a computer running Windows 10. The CPU is hooked up to a monitor and a smartboard. When I pressed this combination, I lost display on both the monitor and the smartboard, and I can’t get either back. My tech support tried many things, including unplugging the monitor. When he unplugged the monitor, I got display back on the smartboard. Does anyone know how I can get my display back on both screens?