Common Problems Of A Monitor

PROBLEM 1: There actually no power being supplied to the monitor or monitor is dark or power indicator light is not lit.

some steps to take in resolving this problem might include:-
Plugging in a lamp or other device to the electrical outlet to verify that the outlet is working. If it is not, contact the electrician to fix the outlet and plug the monitor into another outlet.
If the monitor is plugged in to a UPS, Power strip, or surge protector, verify that the unit turned on and has power.
Verify that the connections of the power cord and the monitor cable are secure on the monitor as well as on the PC and the electrical outlet.
If there is a fuse on the back of the monitor, remove the fuse and check for a broken wire. Replace the fuse with a good fuse or put the fuse back in if isn’t blown. If even after replacing with a good fuse, If the fuse blows or if it is still doesn’t power up, you have a problem with the electrical circuitry inside the monitor. Your only option is to take it in for repairs.
If the monitor still is not working, replace it with a known good monitor. Unplug the video cable from the monitor port on the computer and unplug the monitor electrical cord from the electrical outlet.

PROBLEM 2:– The LED on the monitor glows(or blinks) but the screen is blank

Another common problem. Check the brightness and the contrast settings. Sometimes the settings are turned way down, giving you a blank screen. Also try other display controls.

Check if monitor is incompatible with the PC or the CRT is dead. If the monitor is being connected to the PC for the first time, it could be that you have a monitor that is compatible with your PC. Check if the monitor works on the another PC. If monitor doesn’t work on that PC either, then it is almost likely some sort of internal failure in the monitor. Get it repaired or go for a new monitor.[DON’T TRY TO OPEN THE MONITOR YOUSELF. THERE ARE HIGH VOLTAGES INSIDE AND IT IS BEST LEFT TO A MONITOR PROFESSIONAL WHO KNOWS WHAT HE IS DOING].
There might be a problem with the signal between the PC and the monitor. In case of modern monitors this can be checked very easily. Detach the cable from the VGA port and see if the message ‘NO SIGNAL’ is available. This message is known as On Screen Display Message(OSD).Absence of any message does not rule out the possibility of a problem with the cable between the monitor and the PC. If the monitor works with another PC and the signal cable is detachable, use a different signal cable. If not then the problem is with the video card.

PROBLEM 3:– The monitor is producing a high pitched whine.Try adjusting the brightness and contrast controls. This may reduce the noise somewhat.

This can be due to the EMI(electromagnetic interference). There may be a magnetic buildup due to the magnetic field. Move the monitor away from florescent lights, speakers, other monitors, or other electronic device with powerful motors.
This problem occurs in cheaper monitors. The internal component may damage. Replace it with a quieter monitor of good quality.

PROBLEM 4:– The screen is totally white or grey in color.

There might be no signal from the video card.
The monitor cable may not be securely connected to the video port or there are bent and broken pins. Straighten bent pins and re-seat the cable.

PROBLEM 5:– The screen flickers and produces distorted image.

cable may not be securely connected to the video port or there are bent and broken pins.
Monitor might be connected to the incorrect display adapter or incorrect display driver might be installed into the computer.
Flickering generally occurs when refresh rate is set too low. Flickering can be a stain on the eyes.Increase the refresh rate to the maximum supported level. Note that setting the refresh rate too high can cause blank screens-you’ll have to revert to the old settings. High refresh rate can damage the monitor and may go into power saver mode.(refresh rate can be set navigating to:-right click on desktop—>properties—>settings tab—>advanced—>monitor)
If the monitor is interlaced, replace it with a non-interlaced monitor.
There may be magnetic buildup. Degauss(demagnetize) the monitor by turning it off and on by pressing the degauss button. Move the monitor away from florescent lights, speakers, other monitors, mobiles, or other electronic devices with powerful motors.Magnetism of metallic elements on the surface of the CRT causes irregular discoloration along the edges of the screen.

PROBLEM 6:– Application specific problems

If the screen goes blank, flickers, or acts erratic when a specific application is active, the application may require different color quality or screen resolution.Adjust the required settings and display properties.

PROBLEM 7:Monitor makes crackling noise
crackling can be caused by dirt. Clean the monitor top avoid electrical hazards. If necessary, send the monitor repair facility for more in-depth cleaning.
It may be due to failing components. You might smell burning wire. Send it for repairing

PROBLEM 8:– The display is too bright or dim; the contrast is too high or low.
The brightness and contrast settings may not be set correctly. Check the brightness and contrast settings.
The CRT may be wearing out. As the CRT ages, the screen will start to dim.

PROBLEM 9:– The screen has a bluish, greenish and purplish tint.

This is usually caused by a break in one of the three color signal between the video card and the monitor.Check the signal cable for kinks, frays and other signs of wear and tear. If the cable is not integrated , have it replaced, else take the monitor to the repair shop.

PROBLEM 10:– The screen twists with wavy lines and the picture bends.

EMI is the only cause of this problem. Move the monitor out of the range of the electronic components causing EMI.

PROBLEM 11:– Images are blurred

This may be a problem with the display settings of the monitor,or with the signal cable.Adjust the display. There might be an option called‘Focus’ or ‘Sharpness’. Adjust that setting. If that doesn’t work,check the cable and its connection to the PC.

PROBLEM 12:-The display is too large or small or the screen is spilling out.

It could be either that the horizontal, vertical, and other image controls are adjusted properly or it could be a problem with the video driver. Adjust the image controls of the monitor. Check the screen resolution and try lowering it. Ensure that you have the correct video driver for your video card. Check the options in the video driver software to adjust the screen size.

PROBLEM 13:– The image is scrambled or jumping, or there are diagonal lines.
The display controls could have ‘pushed’ the image off screen. Adjust the display controls and see if you are able to get back a stable picture.
It may be problem with the refresh rate or the resolution being set too high. Reduce refresh rate and/or the resolution. If you are not able to see the screen, reboot and press[F8].select safe mode from the list of options. Windows will start with a simple driver at a low resolution and low refresh rate. Disable any video drivers(through device manager).So that window is forced to use its own driver to handle display when you reboot normally. After rebooting in normal mode, enable the driver and run the video driver at the basic resolution. Readjust the refresh rate and resolution to below the values that caused the scrambling.

PROBLEM 14:– Monitor comes on, but then goes blank after a few moments.
Determine if the monitor power light is glowing green or orange.
If the light is orange, Press a key to arouse the system from the energy-saving mode. Some monitors only seem to wake up when windows key is pressed on the keyboard.
change the “power management” setting in CMOS to disable sleep or doze mode. The exact steps for this based on your system BIOS.
In display properties, on the screen saver page, adjust the wait time to meet the user’s needs. Click the power button to access the power schemes and settings for the power options properties dialog box and set those as appropriate to the user’s needs as well.

PROBLEM 15:-Physical damage

Monitor dropped or tipped have sustained internal or external physical damage. Do not open the monitor(High Volt Hazard). Send the monitor to an authorized repair facility.


Thanks to for the great idea on how to analyze problems of a monitor.