Problem with VGA display on HLN-5065W

Hi All-

I'm attempting to connect my 360 to a Samsung HLN-5065W via VGA connection. When I have the cables connected and switch the Samsung to the PC input, I get a "Not supported mode" message on the TV. I feel sort of dumb for asking, but what am I doing wrong/missing? The 360 works via VGA to an external monitor, but just not on the VGA input on the Samsung. Any ideas?

Thanks.

Sorry - I got it working. I connected the 360 to a spare CRT monitor I had laying around and set the resolution to 1280x720 and then connected it to the Samsung and all is well.