Hi JeffMaier, we are unable to know if the HDMI cables you are currently using from 2014 are 4K HDMI cables. So that we can better assist you with this, please reach out to Samsung Support via any of these options:
Phone: 1-800-SAMSUNG
Available 8 AM - 12 AM EST 7 days a week
LiveChat or Text: https://www.samsung.com/us/support/contact/
Facebook Messenger: https://www.facebook.com/samsungsupport
Twitter: https://twitter.com/SamsungSupport
The Samsung TV Community is also a great resource for getting help from Samsung moderators and customers: https://us.community.samsung.com/ ^Gina