MD 20122 SCREEN PROBLEM

There is a very good answer to your monitor issue found here:

http://www.fixya.com/support/t467725-samsung_lcd_monitor_syncmaster_203b

It may be the internal backlight that is failing. When the display has failed but still has power, take a flashlight and hold it close to the screen, move the flashlight all around the screen and check if you can see anything. The display will be dark, but you should be able to make out the image that is there with the flashlight technique. If you can see an image on-screen, then your backlight has failed and you will need to replace the monitor. Weather or not you see an image is not a critical issue, but a tool to verify if the backlight is off or some other issue is causing the problem.
Note, it may be difficult to detect an image on the un-light display, for example if you have a dark image as your desktop background. So make sure to fully scan your display (top to bottom, and left to right covering the entire screen) with the flashlight technique in order to see any image on-screen.

It may be the internal backlight that is failing. You can take a flashlight and hold it close to the screen, move the flashlight all around the screen and check if you can see anything. The display will be dark, but you should be able to make out the image that is there with the flashlight technique. If you can see an image on-screen, then your backlight has failed and you will need to replace the monitor. Weather or not you see an image is not a critical issue, but a tool to verify if the backlight is off or some other issue is causing the problem.
Note, it may be difficult to detect an image on the un-light display, for example if you have a dark image as your desktop background. So make sure to fully scan your display (top to bottom, and left to right covering the entire screen) with the flashlight technique in order to see any image on-screen.

Either the power supply board is failing and needs repair or a bad bulb in the screen is causing it.
You would have to open it up to get a better idea.

Here's some info:
MAKE SURE ALL POWER is DISCONNECTED For at least 5 minutes PRIOR TO WORKING ON inverters.
If your picture wasn't pinkish or dark at the top or bottom when it was working, then it may be the inverter has gone bad. Inverters are like light bulbs and have life expectancies on the capacitors.
If your picture was pinkish or dark at the top or bottom when it was working then you may have 1 or more of the bulbs failing.
You can check for pinkish if your screen flashes.
What you do is when you have it open to the point of getting to the wires that hook to the back of the lcd screen is to disconnect only the wide ribbon that goes from the video board to the back of the screen. Then start it and check the screen flash color.

These come apart a little different than most. The front trim comes off with the screen. So essentially you are removing the back case first:
Once the four screws are out of the rear corners there are snap tabs that need to be released between the silver trim and the back black plastic (three top and bottom and two on left and right.)
You can use a thin knife blade to help release them as you separate the silver from the back plastic Black part has to be bent outwards to release these tabs.
Then entire guts will come out with the screen ., then the inverter is under the center area under the metal cover.
Shout if you need more info.
If you email me a good picture of the inverter in the area of the larger yellow square component and one from underneath , behind the two small yellow square components, I may be able to get a better idea if it is the inverter from a visual.
Email : [email protected]

Sometimes inverter module is combined with power supply (and looks like that is your case) and just located in separate areas on the same PCB. Take a look at that board, the area where high-voltage wires are coming in is the inverter. Capacitors, the cheapest would be on jameco.com, but better quality is at mouser.com or newark.com or digikey.com or alliedelec.com.

sounds like your monitor is starting to go out. if there are any speakers near your monitor, it is likely magnetic interference. try moving your monitor to a different area and see if it still does this. if it does, i would replace the monitor. if it doesn't, just simply reorganize the area around your monitor and it should go away after degaussing the screen.

your system display settings are set to a wide screen setting on desk top right click then properties, right had tab display then set the screen size to a square shape like 1024 x 768.

Ok, when connecting to another monitor, be sure to use the Function Key, and press the appropriate F Key to enable an external monitor. Without doing this, you will never see an external picture.

If that picture is fine, then yes, you need to think about your video card, and I would start with updating the driver.

Erik.

what is the solution for this? my husband just turned his pc on when we got home and there are line blue lines running up n down in the black

Same problem Picked up this monitor about half a year ago, a Viewsonic A91f+, and have been having some issues for a while now concerning what appears to be shifting in the monitor image, but that is about the best I can describe it as. It is most noticable when a large dark area meets a light area, like text or window edges. This "shifting" only occurs on the right side of objects and seems to show most often after I switch resolutions more than a few times, usualy due to gaming. Ive also noticed it happening from running random programs that dont require resolution changing/flickers but this happens FAR less often. -photograph of the effect- As you can see, its pretty subtle on a darker background, but Ive had no luck carturing it on a light one. Anyone have any idea as to what is occuring on this monitor and how it could possibly be fixed? Possibly an issue with magnets? For a while, I did have a small headset hanging off the the monitor on the side that the images "shift" towards, but even taking those off and away havent fixed it. Currently the only fix I have found for this is to shut my monitor off for 5-30 minutes, depending on how bad the "shifting" is when I find a time break long enough to fix it.