Hello Tony - I am sure you already tried selecting source for the HDMI you have connected? Have you also contacted your cable provider? If these didn't work, so that we can better troubleshoot towards a solution, please reach out to Samsung TV Support at:
― Phone: 1-800-SAMSUNG / Available 8 AM - 9 PM EST, Mon - Fri
― LiveChat or Email: https://www.samsung.com/us/support/#contact_us_for_support
We look forward to hearing from you. ^Cris