LCD monitor troubleshooting iis a very methodical process by which you eliminate potential sources for problems. You'll need to take things slowly and patiently to diagnose computer monitor problems. If that's not for you, hiring a professional for computer monitor repair is your best option.

Make Sure It's Plugged in
Always start monitor troubleshooting by making sure everything is plugged in. Check the power cord to make sure it’s firmly seated in the monitor and the power outlet. You may want to unplug the power cord both from the wall and the monitor and reconnect it to make sure the connection is snug.

Next, check the PC cable. Make sure one end is connected to your video card, and the other is securely connected to your LCD monitor. Again, you might try unplugging the cable entirely and reconnecting it to make sure your connections are secure. If you notice changes in the picture quality when you move the cable from the PC, it's time to replace the cable.

Detailed Troubleshooting
The key to successful monitor troubleshooting is to take one step at a time and only make a single change with each step. If you try to do too many things at once, you’ll be unable to determine what’s actually causing your monitor problems. If you change three things and the monitor works, you won’t know which fix corrected your problem. Only make one change with each round of troubleshooting, then see if your monitor problem is resolved.

Starting Up
Some LCD monitor problems are related to your operating system. Watch your computer start, and see if you have the same monitor problems before your operating system loads. If you do have the problems when your computer is starting up, the problem may liee with the monitor itself. If the problem doesn’t start until your operating system loads, it’s probably related to your drivers and you should adjust your display settings or reinstall your monitor drivers.

Use a Second Monitor to Diagnose Problems
If you’ve got a second monitor or have a friend with a computer monitor, try switching the monitors to see if you still have problems. If your problems are resolved when you switch to a different monitor, you may have driver issues or your monitor may be on the way out. If you still have problems with a different monitor, you may need to replace your video card.

Try a Different Video Card
Swapping video cards can tell you if you need to replace your computer video card. If you have an old video card from another computer that you can swap out with your current card, make the switch and see if your monitor problems are solved. If the problem goes away, your video card might be the culprit. If you still have issues even with an old video card, and you’ve installed the correct drivers, you might have another monitor issue and you should consult a professional.