Anyone with the 25/50 FPS + VGA cable bug (i.e. no picture but sound unless you use 640x480) might want to try this I've just seen on another forum. Haven't tried it myself yet though so cant say if it works or not...
EDIT - yes it works
EDIT - yes it works

here's how to fix that problem but you need component cables
When trying to play 25 or 50 fps content, I don’t 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 doesn’t 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
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