I have a 24" monitor with an HDMI port. 1920 x 1080 on resolution. My graphic card supports it and up to 2560 x 1600. But I don't see a full-screen display. The resolution setting gives recommendation on 1920 x 1080. It only gets a full-screen at 1600 or so, but I need more. Is it because I'm using windows 7? Thanks in advance.