I have a similar issue with my Samsung 2233SW: Sometimes when my system boots up, my screen resolution is wrong (It defaults to "Non-Pnp VGA Monitor" or something similar) and the highest resolution I can choose, even in advanced/list all modes is usually 1600 x 1200, which just looks weird in widescreen. If I reboot once or twice it will suddenly "fix" itself and recognize the Samsung properly.
When I first installed Windows 7, I did not install the driver
from the Samsung disk, because it already correctly recognized it and all of its supported display modes. However, when I first had this problem, I decided to go ahead and install the driver from the disk and it helped... for about a week, then started doing it again. I also do not have CCC installed, but when I installed it, it didn't seem to help, since it will not allow me to select modes that it thinks are not supported by my "VGA" monitor.
So.... is there a way to FORCE my system to use 1920 x 1080 x 32 @60Hz, even if it thinks my monitor can not support it?
Thanks in advance!
p.s. I even re-installed Windows 7 because I thought that would get rid of the problem, but it soon re-appeared. It seemed to start after one of the updates, but I don't know which one (You can imagine how many megabytes of updates got downloaded upon a fresh install of Windows 7!). Probably the ATI update?