I have a Dell Latitude D620 with Windows Vista Ultimate, which I connected to my Samsung 46 "1080p LCD HDTV via D-Sub. On the PC input, "says TV" function is not supported. "PC option from the menu to the TV are grayed out. I can not set the resolution of 1920X1080 PC monitor – which returns to a different res. Any suggestions?

Ok, I have a Dell Inspiron E1505 laptop running WinXP, and a Samsung HDTV. I have a VGA cable, as I try to use to connect your PC to your TV so that I can show you pictures of my family from my laptop. The problem is when I unplug the VGA cable for the computer and the other end of HDTV, when I go to the source computer, it was "Mode not available", or when you are "looking for signal", I just blackouts.
Help?