Confirm that a power cable is connected to the monitor and a power outlet.
Monitors do not receive power through the video signal cable, but instead need their own power connection.
Ensure the video cable is connected to the correct video source.
Laptop Computers: In Dell laptop computers all the video connectors use the same video card and additional video cards cannot be installed in the computer.
Desktop Computers: Look at the back of the computer (Figure 1) to check for any installed add-in video cards. Usually, integrated video cards are automatically disabled when an add-in video card is installed.
The monitor must be connected to the add-in video card, if present.
3. Ensure that the correct type of video cable is connected. Note: Use only one video signal cable to connect the monitor to the computer. Only one connection is necessary and connecting more than one can cause problem.Add-in video cards that use a connector type other than DVI or VGA require a cable adapter, or dongle, to connect to a monitor.
Check the Video Cable
Examine the video cable connectors for signs of damage (Figure 2).Figure 2: Bent or Broken pins in a VGA Connector.
Make sure the connector is fully inserted (Figure 3).Figure 3: VGA connector not inserted fully.
Try a known good video cable with the monitor.
Blank Screen or No Video
Confirm that your computer is turned on.
Look for the monitor power LED.
Press the power Button ON.
Status of Monitor Power LED:
No light – The monitor is not receiving power.
Amber/yellow light – The monitor is not receiving consistent power.
Green/blue light – The monitor has power.
Check the power connection to your monitor.
Unplug the power cord from the back of the monitor and the wall outlet.
Plug the power cord into the back of the monitor, and then into a working wall outlet.
Press the Power button on the monitor.
If your monitor still does not have consistent power, look for another power cord (If available).
If your monitor still does not have power, contact Dell Technical Support for further assistance.
Confirm that your video cable is connected to your monitor. For more information, refer to Connecting the Monitor to your Desktop Computer. If a add-in video card is installed in your computer, the standard video port is disabled. Your monitor must be connected to the port on the add-in video card.
Confirm your video input source.
Use the Quick Access or Input button to confirm that your selected video input source works with your monitor’s video card.
Run the Built-In Diagnostics for your Monitor to verify the functionality of your monitor.