Desktop Computers and Laptops have built-in-graphic cards which transmit video signals to external monitors. Also, these cards aid in processing video game information. Sometimes, this cards may be damage. So, if you faceing any problems with your desktop or laptop graphic card, you can do certain steps to solve these issuses in simple but effective ways.

Find an air intake vent on your desktop or laptops. Wipe it down to clean it well. This vent is responsible for bringning air and air is necessary for good running your graphic card. Also, you can spray compressed air to the vents to remove the accumulated dust attached to the video card itself. This would help the air circulate around the graphic card more easily.

Also, check your external monitor's cable connection which you have conected to the connection ports of the graphic card. If you see it loose, you hace to tighten so that the video display will reach the monitor well.

Finally you can updated drivers by visiting the site of your computer's manufacturer.