Dark screen when i try to watch a dvd the screen is so dark most of the time you don't know what your watching.there is no control on the monitor to make the screen brighter. Help

This is the way how to examine what's wrong with your LCD monitors. After you turned it on and the screen to dark, you have to check that if you still can see the image on the screen or not by shining a flashlight into the screen, not directly but find the best angle to the screen and take a look very closely. If you can see the icons or any image, there will be a minor problem. This is because of the lamps inside screen. Some of them were broken and it is very easy to replace. If you cannot see anything on the screen, there'll be some problems with inverter board. If you have soldering tool and want to fix it by yourself, check the caps first. It may cause this problem. Some caps might show leaking or burn spot on the board because of too high temp. If you don't have soldering tool, you better go get a technician to do so. Hope this help!! If anything I can help you with, feel free to let me know.
Thank you,