Advice on Troubleshooting PC Monitors

Troubleshooting the monitor solves the problems associated with it. The monitor has a Light Emitting Diode (LED) that glows continuously in green color when system is ON and blinks in Amber color when the system is in standby mode or is shut down. Problems in displaying the picture on a new monitor may be caused if the monitor is defective. The CRT monitor uses a very high voltage to produce the display image on the monitor screen. Be careful while opening the monitor.

Display picture appears too bright or dark.
  1. Adjust the brightness settings using the controls on the front panel.
  2. Adjust the contrast settings using the controls on the front panel.
  3. Switch the lights OFF to check that the brightness is not caused due to the lighting in the room.
  4. Try using an antiglare screen.
There is no display on the screen.
  1. Press the button on the keyboard or move the mouse to wake the system if it is in the standby mode.
  2. Switch the monitor OFF and then switch it ON again.
  3. Increase the brightness and contrast.
  4. Press the power supply cables and the signal cables firmly in the sockets.
  5. Reboot the system. Use POST of the monitor to check that the monitor is working.
  6. Troubleshoot the video adapter.
Cannot change the settings
  1. Check if the settings are locked. Refer to the user manual to unlock the settings.
  2. Check if the settings are set as the maximum or minimum limit.
Display picture appears Wavy or have color patches
  1. Relocate the devices that have strong magnetic fields such as speakers and mobile phones that are kept near the monitor.
  2. Connect the monitor to different power supply socket.
  3. Change the location of the monitor.
  4. Use the Degauss button to minimize the color patches, which are generated due to the magnetic field around the monitor.
  5. Switch OFF the monitor and then switch it back to ON condition
Monitor screen shows no signal output or similar message.
  1. Make sure that the connection of monitor to the computer is solid.
  2. Try using another monitor.
  3. Try to plug in your monitor in some other computer system
Monitor shows curvy or wavy lines
  1. Remove any extra accessories such as antiglare screens and cables connecting the monitor to the peripheral devices.
  2. Clean the monitor with a soft cloth.
  3. Test the monitor using other applications such as notepad, excel,etc. If the problem is software specific, troubleshoot the software.
  4. Change display settings to display at a resolution and refresh rate which are supported by the monitor.
  5. Try using another monitor.
  6. Try to plug in the monitor to some other computer system.
Computer boots but Monitor is blank
  1. Check if monitor is plugged firmly into a working power socket or power strip and that the power strip is ON.
  2. Check if the computer can boot normally.
  3. Try to plug the PC or power strip into another power socket.
  4. Verify that the monitors power button is switched ON.
  5. Make sure that the monitors brightness and contrast controls are properly adjusted.
  6. Check that the monitor cable is plugged firmly, and the pinned end is tightly screwed into the computer’s video output port.
  7. Remove the existing cable and replace it with another working monitor cable. Connect it to the display and the computer.
  8. Obtain a working monitor and connect it to the PC. If monitor works then, contact a technician and buy a new monitor. If the monitor does not work, the video card may not be working.