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Try the xf86config program. Or, edit the file /etc/X11/XF86Config manually -it's well documented! For example, my monitor section looks like this:
Note: The important parts are horizontal and vertical refresh rates. DON'T JUST COPY THESE! Might damage your monitor... These values are in the manual for the monitor.
# HorizSync is in kHz unless units are specified.
# HorizSync may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
# VertRefresh is in Hz unless units are specified.
# VertRefresh may be a comma separated list of discrete values, or a
# comma separated list of ranges of values.
# NOTE: THE VALUES HERE ARE EXAMPLES ONLY. REFER TO YOUR MONITOR'S
# USER MANUAL FOR THE CORRECT NUMBERS.
try configuring it in text mode...i know its pretty hard but it would be the next best thing besides re installing it again...
just use any editors(vi, pico, etc...) to configure the file lenny showed here...lenny is right, dont simply copy the settings. it might mess up your monitor...it could cause permanent damage
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