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It could be 1 of 2 things, either your monitor is going out on you, or your graphics adapter is going bad. Depending on how long ago you purchased it, and from whom, I would contact Dell service to find out if they can return it, or give you any suggestion.
The entire image is squeezed in that thin line because the vertical deflection unit has failed - the monitor will have to be opened, the vertical circuit identified and replaced - all this must be done by a repairman so take it as fast as you can to one. If you keep it functioning this way for long the screen will be burned.
The fault looks like white lines horizontally along the screen. These are the retrace lines that become visible due to absence of proper screen/grid voltage. You will need to open the monitor only if you are familiar with power electronics, a bit of experince is important as the stages are delicate and contains high voltage. If not take help, check for faulty capacitor or low value of resistors in the screen/grid sections of the crt. Couple across parallel to the suspected capacitor to confirm and change. Use a meter to see the voltage across faulty resistors. In some cases reducing the screen potentiometer ( onthe Line output transformer)can solve the faulty. Hope you try. Good day
It is good to buy a new one because if you get it repaired even if you are not satisfied with the result what then? So my advice is to buy a new one and you will have a satisfaction of having a new one. Thanks for asking a advice from me
Carefully give your monitor a quick slap on the top or side, NOT like you would hit an assailent, but more like you would hit your brother if you were kidding around with him. If you get a positive outcome from the slap, you have located your problem. I'm assuming a CRT type of monitor. Probably the monitor has either a bad connection inside it or is simply dying from old age. Vertical Deflection grids supply voltage so that screen stays full top to bottom. If the output of the VDG is abnormal or missing, you will experience the horizontal line across the screen.. Unlikely to be the video card on the computer, generally speaking intermintency is not a common problem with video adapters, not to say that it couldn't happen,