Did you run DXDIAG and head to the OVERRIDE TAB to limit it, set it to 60?
I am using my Samsung DV3 32 inch HDTV (LA32C450E1DXXY vAO01) as a PC monitor with the resolution 1280x720 60Hz at 16:9 aspect ratio.
Can I just start by saying how impressed I am with this TV. I am running my PS3, blueray, TV and a PC all from the one device and it looks absolutely incredible.
But I have a problem when I try and play PC games with this setup. The instant the screen toggles it's resolution the monitor displays a 'Mode not Supported' error and there is nothing I can do but restart the computer.
I am running Windows XP. I believe it is trying to set the resolution to 1024x768. Is there a way to stop this from happening?