Calling all IT pro's. I just bought the DELL S2440L 24" monitor but facing some issues. If I go to max resolution 1920x1080 the screen has black lines flashing on it and every few minutes the screen goes black for a couple of seconds then comes back. I found if I lower the resolution to 1280x720 there is no problem. I am connecting via HDMI because my monitor only has VGA which my graphic card has only DVI which is a ATI Radeon HD 5700 series. Here is the video http://www.youtube.com/watch?v=nh00hdEHo4c Any help appreciated!