I know from what you'be mentioned, however, did you make sure you are using the correct aspect ration for your monitor? 4:3/16:9/16:10. Did you mess with custom aspect ratios at all?
If you have messed with the config file in any way and need to reset to defaults for the most part on the graphics as far I know, just delete the brink cfg which is located "Steam/Userdata/"numbers"/22350/local/base/brinkconfig.cfg.
Uninstalling the game may have not fixed your config file. Give that a shot and get back to us,