Hi,

To isolate the issue with hardware or software, let’s run the diagnostics on the computer,

To run the ‘Dell Diagnostics’

1. Power off the computer
2. Restart the computer, press F12 on the Dell logo
3. Select ‘Diagnostics’ from the boot menu
4. Please refer to the link if any error code shows up
   http://dell.to/MNniAq

Please check with a different monitor if you experience the same problem.

Alternately, try the below mentioned steps:

1. Click on the link http://bit.ly/PxdR9Y
2. Click on Run now
3. Download and save the file and run it
4. Restart the computer and check.

If the above step does not work, then run the diagnostics for the monitor,

Here are the steps,

 

1. Unplug the video cable(s) from the back of the computer or monitor. The monitor then goes into the self-test mode
2. Press and hold the Button 1 and Button 4 on the front panel simultaneously for 2 seconds. A gray screen appears
3. Carefully inspect the screen for abnormalities
4. Press the Button 4 on the front panel again
5. The color of the screen changes to red
6. Inspect the display for any abnormalities
7. Repeat steps 5 and 6 to inspect the display in green, blue, black, white screens
8. The test is complete when the white screen appears. To exit, press the Button 4 again

Then reset the setting of the monitor to Factory Defaults.

 

1. Press button 3 on the monitor. (refer image)
2. Choose ‘Other Settings’
3. Press the   and  buttons to move between the setting options
4. Press the  or  button once to activate the highlighted option
5. Choose ‘Factory Reset’
6. Press the  button to go back to the menu
7. Or  button two to three times to exit the main menu 

Then, update the video drivers. First check the video card that’s installed on the computer from Device Manager

1. Click on Start
2. Right-click on Computer
3. Click on Properties
4. Click on ‘Device Manager’ on the left sidebar.
5. Expand ‘Display adaptors’
6. Check the name of the graphics card

Then go to our support site and install the drivers:

1. Click on the link http://dell.to/R2EYbS
2. Type the Service Tag of the computer
3. Choose the operating system
4. Click on Video
5. Select the video card installed on your computer
6. Click on ‘Download File’
7. Click on ‘Download Now’
8. Click on ‘Save’
9. Choose the location as desktop, save the file on the desktop
10. Double click on the file; choose ‘Continue’
11. Click 'OK' on Select the folder where you want to unzip the files to( Make a note of the folder location)
12. Click ‘Yes’
13. Click ‘Ok’, follow the on screen instruction and install the file
14. Restart the computer

In case you do not get prompts on the screen for instructions, then

1. Browse to the folder where the files were unzipped to and locate the setup file
2. Double click on the file; Follow the onscreen instructions to complete the installation.