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The answer may be this: Windows XP has a known bug which forces the refresh rate to 60 Hz, no matter what refresh rate you choose. A fellow has written a hack for this in the form of two programmes called something called "RefreshLock" and "RefreshForce", which you can Google.
My monitor, at least, has an on-screen display I can activate which tells me the actual refresh rate/resolution in use, as opposed to what Windows says. I find sometimes, with my ATi card, Windows forces my refresh rate down to 60 Hz from my chosen 75 when coming back from hibernation or power-down, and I have to go into the ATi Control Panel -- which still thinks it's running at 75 Hz -- to correct this. What I do is to choose another refresh rate, and then when it prompts me to keep the setting hit "No"; that kicks me back out to my preferred settings.
If your refresh rate has changed, it should afect the CRT's High Voltage [flyback-derived supply, they never have good regulation] and thus the physical size of you picture. Have you noticed this?
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