Samsung One Connect error - red triangle with exclamation mark

[MattGoyer]

We have a Samsung Frame TV. When powered on it displays a red triangle with an exclamation mark above an image of the One Connect box. I've tried using a brand new One Connect cable and tried using a different One Connect box, but we still get this error message. I tried calling Samsung support, but their only recommendation is to have a local technician out, but we're out of warranty so I don't know if it is worth going doing the repair route given we can buy a new (non-Samsung Frame) TV for likely the same cost as repair (if it can be repaired.)

[Petrazap]

Hello, same problem here. Try to disconnect all the cables for 30 minutes, it worked for us. We got that advice from Samsung support. 

[ddesma]

Perfect advice. 
Works without problem after 30min. 

[CarloFlorida]

I had to leave it unplugged overnight then it restarted but does this error when I try to use the HDMI port with my Firestick attached.