My screen resolution appears to have changed

Hi GrahamFromky,

If you believe you are having resolution issues with your Apple TV, you may find the following article helpful:

Change the Apple TV resolution:

• Press and hold the Menu and Up button on your Apple Remote for six seconds.
• The Apple TV will automatically cycle to the next resolution at approximately 20 second intervals.
• Press Play on the Apple Remote to keep the current resolution or Select to manually cycle to the next resolution.

Apple TV (2nd and 3rd generation): Troubleshooting video issues

http://support.apple.com/kb/TS5148

Regards,

- Brenden