It could be. Do you remember if anything changed after any event, like connecting, disconnecting, etc?
You might try resetting the software by, with the TV powered ON, pressing and holding the EXIT button on the remote for 15 seconds - you'll be prompted to "RESET?", Choose YES and click the [Enter] button.
Keep in mind, this will reset your picture and audio settings, as well as any network you have setup.
Does that help?
I bought a Samsung PN63C7000 four months ago and since two day sago it will not tak any input from any of the HDMI inputs. Alll I see is a black blank screen. Any thoughts? Could this be a software problem?