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You didn't say which OS you're using but it sounds like you've changed the aspect ratio of your video signal. Different screen resolutions have somewhat different aspect ratios. The aspect ratio indicates the ratio of the number of pixels of width to those of height. For example: my video driver offers a resolution of 1280 x 960 or 1280 x 720 which would give screen aspect ratios of 1280/960 = 1.33 :1 and 1280/720 = 1.77 : 1. The latter would produce a narrower image. You can compensate somewhat by increasing your horizontal sweep voltage with your monitor menu. A better solution would be to select a resolution that more closely matches your monitor's screen size.
on the desktop screen do a right click
you will be getting a drop down box
there select screen resolution
you will get a screen opened
there you can find an option as resolution
you can chage the resolution of your screen there
Check the specs for your video card. Just because the monitor can handle that resolution does not mean that your graphics card can. If it cannot then you can either upgrade the graphics card to one that will support the resolution or you'll have to use the highest resolution that your video card can support. Hope this helps.
Since the image on the projector is OK then the problem definitely lays in you monitor. You might want to turn off any other electrical equipment in your lab, especially any kind of radio transmitter and see if that is affecting your picture. Strong magnets or large power cables can also generate magnetic fields that can adversely affect CRT pictures as well.
If that isn?t the problem then it is likely the monitor. It can be fixed; however, this is typically beyond the skills of the average user. Any TV and some computer repair shops can repair a CRT but is it economically feasible? A new 17? CRT can be had for $60 on-line and that has a 1 year warranty. Repairing your old monitor could easily run that or more and usually is only warranted for 90 days.
Let us know if you have any other questions and please don?t forget to rate this posting.