No picture is displayed
Check to make sure the monitor cable is firmly connected to the video adapter
Double-check that the computer has power and it is turned on
Check the monitor brightness controls to make sure it’s turned all the way up
Check the input settings on the monitor. It may support DVI, Vga, or HDMI inputs and it may be set to an input that you aren’t currently utilizing
The screen is not in sync
Check the monitor cable for a firm connection with your video adapter
Check the monitor’s screen refresh rate in the display settings section of the control panel
Check the display resolution in the adapter settings and make sure it isn’t set to a resolution that is too high for the monitor to display properly
The Screen position isn’t centered
Make adjustments to the horizontal and/or vertical position controls on the monitor to center the display image
Check the monitor refresh rate in the adapter settings and make sure it’s set properly for your particular monitor
The screen is too dark or too bright
Check the monitor’s brightness and contrast controls. And make sure they are set too high or at the minimum
The screen shakes or appears distorted
Check for any objects that may emit magnetic fields, such as uninterruptible power supplies or power adapters, and position them a greater distance away from the monitor
Check the monitor refresh rate in the adapter settings in the display settings area of the control panel and make any needed adjustments to match your monitor’s specifications