HDMI port not working with Cable box
HDMI port will not work with cable box unless a another device is pulgged in to another HDMI port and turned on. When you turn off the second device you lose the cable box HDMI signal The second device still works when the Cable box is turned off
I’m very sorry for any inconvenience this may have given you. It seems that your device may need servicing. Please contact us at 1-800-SAMSUNG, or if you want to come through a social media channel, we have a couple options for you: If you have a Twitter account, go here or to this URL: http://twitter.com/#!/samsungsupport Having a transaction number or model number and serial number handy ahead of time will be helpful. If you have Facebook, go here to this URL: http://www.facebook.com/SamsungSupport Click on the "Support Form" button.