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Your monitor is displaying like it is because the graphics card refresh rate has changed. Check that the display driver is correct for your graphics card and that you are not using the generic windows driver. If the driver is correct then look in desktop properties, settings, advanced, monitor and check that the refresh rate is correct for you monitor.
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Downloading programs would not cause the type of problem you're having. It should be a hardware issue only.
1.The bottom area of your screen is close to a small curcuit panel behind the bottom plastic border of the screen frame. This little panel/bar is called the Screen Inverter. If its connection plug has loosened it could be the culprit.
2. The Display Cable behind the screen panel has become partially unplugged or damaged in some way at the top of the screen, or, it has looseened at its plug connector just underneath the back edge of the power strip panel/keybaord area so that pressure applied to the bottom of the screen frame makes it connect correctly.
3. The Screen Panel itself is failing.
These are the 3 areas I'd say you should have a laptop repair tech look at locally in your area.
Have you tried adjusting the screen resolution? If you are running windows, try right-clicking on the desktop, then going to properties>settings>screen resolution. Set it to maximum available (I think it's 1024x768 on your inspiron). This should sort it out.
Once you change the resolution to a smaller size and you see the black border, go into the monitor's menu and there should be settings for the Horizontal and Vertical size/position. Adjust those until it looks correct.
First check the resolution: Right click desktop Go to properties Go to last tab (up top) and slide bar all the way to the right.
If that doesnt work, reinstall the graphics drivers. http://support.dell.com/support/downloads/download.aspx?c=us&cs=28&l=en&s=dfb&releaseid=R128346&SystemID=INSPIRON%20B120&servicetag=&os=WW1&osl=en&deviceid=3526&devlib=0&typecnt=0&vercnt=3&catid=-1&impid=-1&formatcnt=1&libid=6&fileid=170751
Place you cursor on a blank spot on the black area, Hold the left mouse/touchpad button down and drag it back down to the bottom of the screen. That should get you back to where you want things to be. If that fixes it, please return here to rank this as solved. If it doesn't, let me know and we'll see what else we can come up with. ;o) Ron-