QUOTE(redwolf @ Dec 5 2007, 12:50 AM)

i get exactly the same problems... though i have a different TV, but my setup is also 1360x768 using PAL x360. when i press the info button on my TV the resolution says
640x480@59Hz but blank screen with sound

here's how to fix that problem but you need component cables
When trying to play 25 or 50 fps content, I dont get any video over VGA
This only affects consoles which output PAL-50 and PAL-60 output modes. There is a known issue in which 25 or 50 fps video sometimes doesnt display over a VGA connection if you have previously connected your Xbox over component video output.
The workaround for this issue is as follows:
1. Connect your Xbox 360 to a display device using a component video cable
2. Go to the System Blade
3. Go to Console Settings
4. Go to Display
5. Set your display settings to a different resolution than is currently selected (e.g., set it to 480p if your current setting is 720p)
6. You should see a slider with the words Your display settings have changed. You can keep this setting or try another. Do you want to keep the new settings? If you keep the new settings, your TV will be tested to see if it also supports this setting at 50Hz. Answer Yes, keep these settings to this prompt.
7. After this your display will be tested for 50Hz output
8. You should see a slider with the words Now displaying at 50Hz. Does this display appear correctly? Answer No to this prompt even if the display is correct. Again, make sure to answer No to this prompt.
9. Connect your Xbox up via VGA again. The videos should now play correctly.
and no it does not mean you are setting you 360 to 50hz