Dell ST2220M Monitor - Manual (Page 31)

4. Carefully inspect the screen for abnormalities.
5. Press the shortcut button 4 key on the front panel again. 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, and white colored screens.
The test is complete when the white screen appears. To exit, press the shortcut button 4 again.
If you do not detect any screen abnormalities upon using the built-in diagnostic tool, the monitor is functioning properly. Check the video card and computer.
OSD Warning Messages
For OSD-related issues, see OSD Warning Messages .
Common Problems
The following table contains general information about common monitor problems that you might encounter and the possible solutions.
Common Symptoms What You Experience Possible Solutions
No Video/Power LED off No picture l Ensure that the video cable connecting the monitor and the computer is properly connected and
secure.
l Verify that the power outlet is functioning properly using any other electrical equipment.
l Ensure that the power button is depressed fully.
No Video/Power LED on No picture or no brightness l Increase brightness & contrast controls via OSD.
l Perform monitor self-test feature check.
l Check for bent or broken pins in the video cable connector.
l Run the built-in diagnostics.
Poor Focus Picture is fuzzy, blurry, or ghosting l Perform Auto Adjust via OSD.
l Adjust the Phase and Pixel Clock controls via OSD.
l Eliminate video extension cables.
l Reset the monitor to Factory Settings.
l Change the video resolution to the correct aspect ratio (16:9).
Shaky/Jittery Video Wavy picture or fine movement l Perform Auto Adjust via OSD.
l Adjust the Phase and Pixel Clock controls via OSD.
l Reset the monitor to Factory Settings.
l Check environmental factors.
l Relocate the monitor and test in another room.
Missing Pixels LCD screen has spots l Cycle power on-off.
l Pixel that is permanently off is a natural defect that can occur in LCD technology.
l Run the built-in diagnostics.
Stuck-on Pixels LCD screen has bright spots l Cycle power on-off.
l Pixel that is permanently off is a natural defect that can occur in LCD technology.
l Run the built-in diagnostics.
Brightness Problems Picture too dim or too bright l Reset the monitor to Factory Settings.
l Auto Adjust via OSD.
l Adjust brightness & contrast controls via OSD.
Geometric Distortion Screen not centered correctly l Reset the monitor to Factory Settings.
l Auto Adjust via OSD.
l Adjust brightness & contrast controls via OSD.
Horizontal/Vertical Lines Screen has one or more lines l Reset the monitor to Factory Settings.
l Perform Auto Adjust via OSD.