Computer Troubleshooting

How to troubleshoot a Computer Monitor

Image via Wikipedia

Is the monitor turned on? Check the green LED power on the monitor if it has one.
* Adjust the brightness nod contrast controls all the way to Maximum
Check the video cable from the monitor to the computer to be sure it is properly connected Check the power cable. Is it connected properly on both ends?

* try a different monitor (in your computer if it doesn’t work, the display card is likely at fault, Replace the display card.

* try your monitor on a different computer. If I t doesn’t work, replace the monitor or have repaired by a trained Technician.

Computer boots, but displays “junk” on the screen.
It may be that the display card is defective; try a different card. If it works then your first card may be bad.

* Try the suspected bad card on another computer It it displays the same thing it is fairly conclusive that the card is bad.

Display is dim, overly bright or blurry, or unpleasant. Display is off center. Left or Right side of monitor is obscure.
Try adjusting the control knobs located on either the front or the back of the monitor. It may be necessary to open the monitor’s casing to get the proper adjustment con in this case be very careful because there are high voltage in the monitor

The video display fades and brightens, or is wavy.
The voltage may be fluctuating due to so many appliances or electric devices on the same branch circuit Turn off all other appliances and peripheral, such as printers, external modem, refrigerator, microwave oven transformer, etc,. and see if that solves the problem

* Try a different monitor on your computers if the problem persists; try swapping out the display card. If the problem was solved by changing the monitor, repair or replace the monitor
Image on the screen is not straight across the screen.

If the monitor is still under warranty bring it back to the store for adjustment. If you want to do it yourself, bare in mind that this is a potentially dangerous procedure.

WARNING ! THIS IS A DANGEROUS PROCEDURE because it must he done while the monitor is on and there are very high voltages around the picture tube.

* Open the monitor casing and loosen the clamp holding the coils around the picture tube. You can loosen them (usually there’s a wing nut) and rotate the coil assembly until the picture straightens.