Compared to other computer input output devices like keyboards there are major advances in the display technologies which are used with computers in the last decade. Ten years ago, most of the displays used were CRT monitors. These monitors were heavy and required less maintenance. They were replaced by LCD displays which were lighter in weight and took up less space on the desktop. These displays were also fairly reliable.   It should be noted that in the last few years, almost all computer hardware sellers are only stocking LED displays, officially claiming that they offer better display quality. However, these LED displays are very delicate and will break if they fall.

One of the most common problems faced for all the displays is when the display remains blank when the computer is started. In most cases, the display will have a LED light to indicate the status of the power supply. If the LED light does not glow despite switching on the power supply, it means that there is a problem in the power supply to the display. The power cable to the display may be loose, and fixing it properly will usually resolve the issue. In other cases, the power supply cable is not connected properly to the mains power supply.

It should be noted that even if the power supply cable is connected properly to source initially, over a period of time, the cable may get dislodged or become loose accidently, when anyone in the area, will touch the cable accidently when doing other activities. So it is important to ensure that the power supply cable is checked periodically and if the connection is loose, it should be fixed properly. In some cases, if the cable socket is not fitting in the power supply properly, there may be sparking, and the power supply cable pins may get corroded and damaged over a period of time. In this cases, the connecting cable should be replaced.

In some cases, even if the power supply led is glowing, the display may not show proper images, the image may be distorted, or the display may be blank. There could be multiple reasons, there may be a problem with the graphics card, CPU, display or connectivity. The simplest way to troubleshoot this problem is to check where the cable connecting the graphics card on the computer is connected properly to the input connector on the display.  In case the display problem is not resolved despite fixing the connector properly, it is recommended that the connectors at both ends are checked, to ensure that there is no damage, no pins are bent or missing.

If there is no obvious problem in the display power supply or cable connectivity, there is likely to be a problem in the computer graphics card, cpu, or the electronics in the monitor or display. For those who use computers extensively, for business or personal work, it is always advisable to have a spare monitor for use in emergencies and for testing purposes. If the spare or test monitor remains blank when connected to the graphics connector of the computer, it means that there is a problem in the graphics card, motherboard of the computer, and the computer supplier should be contacted for checking and replacing the graphics card.

In case the computer functions normally when the test monitor, is used, there is probably a problem with the display electronics, internal power supply. Usually most people do not have the expertise and experience to troubleshoot and fix the computer monitor or display. If the computer is under warranty, the manufacturer will usually send their technician to check the display and fix the problem. In some cases, the electronics may be changed, component repaired, otherwise a new monitor will be provided. The warranty terms may differ if the display is purchased separately.

For CRT monitors some of the problems were overheating and damage to the screen. CRT monitors were replaced by LCD monitors which were lighter and took up less space. It should be noted that if the LCD displays were used for a longer period of time, part of the display would be damaged, and would be blank. So the user had to use another display with the computer so that the entire screen was visible. In the last few years, only LED monitors are available, however it should be noted that the manufacturers are not offering any warranty on these monitors. If the display is broken, all the money spent is wasted, unlike CRT, LCD monitors. So the LED monitor should be only used in locations where they are not likely to be damaged, or fall from a height.

It is hoped that the above tips will help in selecting and using the right display for your computer.