VGA monitor cable is used to connect computer monitors to their computers. It is also commonly used for entertainment systems. Unfortunately, it is not perfect, and will occasionally develop problems. Even worse, given a complex enough system with many different devices, it can be hard to tell exactly where those problems are coming from. In situations where your television or computer monitor fails to display correctly, it can be helpful to have a procedure to follow to locate the problem so you can remove it.
Check the Connections
You should always begin by checking your cable connections. Get behind your appliances and take a look at your various connections. Reconnect any disconnected cables to their appropriate spots. If all of the cables are connected, make sure they are plugged into the right jacks. Finally, touch each cable and make sure they are plugged in securely. Even if your cables look like they are plugged in, you should take a moment to tighten their fasteners completely to be absolutely sure that you are not having a problem resulting from a poor connection.
Test the Cables
If your cables are connected correctly, the problem may be with the cable itself. It is quite simple to determine whether this is the case. Simply disconnect the cable and set it aside. Replace it with a new cable — or, even better, a cable from another device that you have just tested and verified as working correctly. Once you have connected your replacement cable for testing, switch on your devices and see if your monitor displays correctly. If it does, you can get rid of your old cable and use your new one, or purchase a replacement if you used a cable from another device.
Check the Monitor
If neither the connection nor the cable is malfunctioning, you may want to check your monitor as well. Make sure it is switched on and plugged into a functioning power source. If it still does not work, disconnect it. Replace it with another monitor you know to be functioning properly. If you do not have an extra monitor around you can use you can try to borrow one from a friend. If the new monitor works correctly, you should consider getting your original one replaced or repaired.
Check the Computer or Other Input Device
If your monitor and cable are working, it is possible that your input device is not. Check to be sure that it is plugged into a power source that works and turned on. Next, if this does not solve your problem, disconnect your computer, DVD player, or another input device from your cable, and plug in a new input device. If this solves your problem, your input device is obviously damaged and the source of your troubles.