I have an old IBM CRT monitor from, I think the 80's, and although it seems like it should support resolutions up to 1024x768 anything higher than 640x480 results in the image being garbled up (sort of being distorted and then tiled around the screen). What I am wondering is if, while having it displaying in, say, 1024x768, if I am shortening the life of this monitor?
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The answer is yes and no, and has to deal with refresh rate versus display resolution.
No, an invalid resolution will not cause damage to your monitor, so long as the refresh rate is still well within tolerance of the CRT monitor. Most newer monitors are "smart" enough to recognize and drop any signalling that isn't valid for that monitor. That flies out the window with older CRT units, though. If the refresh rate is too high, yes, it can damage an older monitor.
While not directly related, this question's accepted answer details that the resolution difficulties you're experiencing should not affect the CRT in any way, so long as you keep your refresh rate in check.
James Brewer
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The monitor is unable to deal with the resolution you are trying to force on it. You will not be able to get a useful result.
Xavierjazz
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