Googling for your monitor, I see that specifications are not obviously available from LG's websites. It is reported to be capable of 1280x1024@85 or 1600x1200@75, and most importantly for X, is DDC compliant.
READ and follow FAQ 11.3.
If you are still having trouble, tell us exactly what part of that FAQ failed to work for you, and post your dmesg, xorg.conf, and Xorg.0.log.
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