Here is my problem. I have a samsung LCD full HD Monitor. I have just purchased a HDMI cable and plugged it in from the back of my computer to the back of the monitor. I have set the screen resolution to 1920x1080 which is optimal output for HD. I changed the main display to the HDMI input on the monitor but it shows the desktop and doesnot pick up the mouse. What am I doing wrong. Please help it is becoming a little frustrating.