IM using a gf4 ti 4200, and when i set the mode for cs to run at 1600 by 1200 it doesnt switch to that size, it just gets bigger and half of the screen is off the monitor ;(
are you sure your monitor supports that resolution?
It maybe the game is asking for a refresh rate at that resolution that the monitor doesn't support.
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according to some digging i did, his monitor cannot handle 1600 x 1200. although it was pretty tedious for me to google through the roughly translated links. i could have had a mis read or bad information.
probably gonna need a 19" monitor at least, most 17" monitors don't big 'ol resolutions like 1600x1200