

If none of those actions work, press the power button. Try moving your mouse, clicking the mouse buttons, or pressing any key (e.g., spacebar) to wake it up. If you stepped away from the computer for a bit and returned to a black screen, the computer is likely asleep.

It may seem obvious, but first, make sure the monitor is turned on. If your monitor initially works when you boot your computer and then goes blank when Windows starts, see: How to fix distorted video after increasing resolution in Windows.
