Are you using the directx9 or 11 version of the game? If the problem occurs on 11, might want to try it on 9 to see what happens.
If my math is correct, 1440x900 is a SD resolution, but you included HD in the description of the monitor. On my HP 2009m the HD resolution is 1600x900, wonder if that might help? Assuming it's really a HD monitor of course.
There are graphics settings in the C:\Users\name\Documents\My Games\Sid Meier's Civilization 5 directory -- GraphicsSettingsDX9.ini and GraphicsSettingsDX11.ini for the two modes. Check the resolutions contained in the file for the directx version you're using to see if they match a supported monitor resolution. Changing FullScreen to 0 should put it in windowed mode, that could help too.