Hi Barry! Make sure the input signal plus setting is enabled within the TV settings. Using the TV remote, navigate to Settings > General > External Device Manager > Input Signal Plus. Enable the option for the HDMI port your receiver is connected to. If you continue to experience issues, please contact Samsung TV Support at:
― Phone: 1-800-SAMSUNG / Available 8AM - 12AM EST, 7 days a week
― LiveChat or Email: https://www.samsung.com/us/support/#contact_us_for_support
We look forward to hearing from you.
^Tim