Monitors decode data from your computer into visible form. Without a monitor, a computer is effectively useless to a user; without visual input, users will be unable to directly utilize any programs or access any data from a computer. There are two main types of monitors, a CRT (Cathode Ray Tube) and LCD (Liquid Crystal Display). Whereas CRT monitors were once the norm, LCD monitors have been rapidly replacing them. Both monitors are capable of developing issues, which include a flickering screen.
Check your video card. You'll need to open up your computer case, so this step should be avoided if you're not proficient in working with a computer's inner parts. Your video card is easily found by locating the cable that connects your computer to your monitor, which then mounts to your video card. Ensure that the video card is firmly mounted into your motherboard. A loose connection can cause issues in data transmission from the computer to the monitor.