Game wont start

Ive been having a problem starting Twilight recently. I previously had a widescreen monitor on my computer and ran Twilight in a widescreen resolution. However, the widescreen monitor stopped working so i switched back to a regular monitor. But when i went to run Twilight all it did was show me a black screen. I tried to run the other versions, DA an DL and they worked fine. I also tried to find an .ini file to manually reconfigure the resolution, but no dice.

Can somebody help? I dont know wether it has to do with the resolution or not, but ive already reinstalled twice. (On a sidenote, its the Ultimate Edition)