Last night, i ended my game with a good tweaking of a new city i built with mods. everything worked fine and ran smoothly. However, when i started the game up earlier today, it crashed my entire computer. it showed merely a black screen and shrunk my resolution to 800x600 (not just the game, my pc too), which i had to change back to 1366x768 when i restarted my computer. i have no idea what may have caused this. if anyone can offer some help i would be greatful.