- Confirm the computer is turned on.
- Check the brightness control, located on your monitor or your keyboard, and make sure it is not set too low.
- Check the connections for the monitor and surge protector and make sure the surge protector is turned on.  
-Screensaver may be enabled, move the mouse around to see if a display appears. 
-Check the power settings in Control Panel. Check and/or change the settings that 'put the computer to sleep' after a certain period of time.