HT201310 what do you do when apple tv says mode not supported

My apple tv stopped working and the tv says either no signal or mode not supported.  I have restarted, unplugged the HDMI cables and restarted again.  I have not updated any software.  This Apple tv is new since December 14.  The TV I have is older Samsung HD.
Can anyone assist?
Thanks

sounds like you raised the resolution to fullhd 1080p and the samsung can't cope
To select a video mode:
Press and hold both Menu and Menu up/scroll on the Apple Remote for about 6 seconds. Apple TV will cycle through different display resolutions.
When Apple TV reaches an acceptable display resolution and "If you can see the Apple logo, select OK" appears on your TV screen, press the Play button on the Remote.

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