Your monitor may not be able to display the resolutions. Take out the video card, and set the resolution on the native display port to the lowest setting. Now turn off the machine, and install the card again. You should be able to adjust it until it works!
OK, so now that it is on its lowest, and it it displays, continue to adjust up until it no longer displays correctly. If you do not confirm changes within a time limit, the resolution will revert back, and you can leave it at its lat good setting! That is it! Good JOB!