I just bought a Dynex 26" flat panel tv and hooked it up to my mac g4 using VGA cord. I selected VGA as the input with the TV's remote, but after the initial Apple icon shows up when I start the Mac, the TV then displays the "No Signal" box. I do not have the TV hooked up to my digital cable box, as I have no connectors for that. I only want to use it for my Mac. Thanks for any help.