Setup your graphic properties for that port. right-click on the desktop and select graphic properties. There, you will find settings for the VGA Monitor port.
I recently bought a Samsung 42" PN42A400 Plasma TV and want to connect my Sony Vaio laptop to the VGA input on my new TV. I can't seem to get it to work. I have set it to the proper resolution and tried various refresh rates to no effect. I can't seem to get the TV to recognize and activate the PC input. I've tried rebooting my computer and getting it to activate when the PC starts up. Nothing I've done works or makes the TV able to switch to the proper input.