Computer Monitor Troubleshooting
When diagnosing a computer monitor problem, half the time it’s usually something very easy, like a cable coming loose, or the monitor getting unplugged accidentally; unfortunately the other half the time it’s probably a problem that’s related to your computer monitor being old, or a problem that’s related to your graphics card instead. So you may have to diagnose both items at the same time to see which solves your problem.

First, check all your cables, I know this is probably getting a little old with the checking connections and everything, but so many computer problems can be avoided if people just remember that their computer isn’t always going to stay the same way they left it. A foot could kick out a cable, a dog or a cat that got to curious, or almost anything can render half your hardware useless.
After checking all your cables, make sure your computer monitor has power, if it has power and shows a message such as “This computer monitor is working correctly please check your cable” and shows bars of color on the computer monitor screen, that means that your computer monitor is not getting a signal from your computer. Try swapping out the monitor for another one to see if it still says that message. If it does then that means the problem is most likely something to do with your graphics card not seated in the motherboard, or just isn’t working properly, you may want to try swapping out another graphics card to see if that solves your problem.
Generally computer monitors don’t have that many diagnosable problems. Either they work and they work well, or they don’t work and you have to replace them. When working on a monitor you should never open them, they aren’t meant to be serviced and contain high charged capacitors that hold lethal doses of electricity. We wouldn’t want to read about a computer guy in the obituaries now would we?
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