Blue Screen

Black Hole

May contain traces of nut
Interesting malfunction: blue screen plus audio.

Oo-er I thought, don't like the look of that. Resync HDMI: no change. Hmm. Wait a minute - menus look OK! So the fault is before the HDMI interface. Change channel: no change. Play a recording: normal. Return to live broadcast: back to normal, fault cleared.

I think my next step would have been a hard reboot. I guess the problem was in the video decoder.