there is no reason why you should have your TV or PC set to 1080i. 1080i is a relic of old HD analog standards. PC outputs in progressive mode. by setting either to 1080i, you're going to get a bad picture because your video card is going to have to deinterlace the image. for a PC you should be setting any progressive resolution. for a standard resolution, 720P (1280x720) or 1080P (1920x1080) or any PC resolution supported by your monitor (1280x800, 1440x900, 1280x1024, 1600x1200, etc.).