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Older monitors are not built to take higher frequancies from videocards. If you synch rate is too high, your monitor will TRY to display the signal; newer monitors are built to not display the signal if they are over-synched.
Sounds like you used too high of a refresh rate on an old monitor that was not designed for such rates.
We used to blow up old monitors by trying to write code that would change the refresh to >200Hz. Many old monitors designed to shut off the input when the refresh freq went over-limit, the result, fried monitor... and SMOKE!
-SF
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