Hi jonathanfromabbotsford,
If you are having resolution issues with your Apple TV, you may find the following article helpful, in particular item number 3:
3. 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