Lights not responding in proper way

[beaverwk]

Heads ar powered ON, yesterday they responded in correct way- today they cant connect to the console probably. DK where to search for issue. 
Some of lights btw are somehow connected- 2 dimmer lights and 1 head - others searching for connection

[kgallen]

So what steps have you tried to debug this and what did you find?

What outputs are you using from the desk - just DMX or something more advanced like ArtNet or sACN?

Have you connected any of the DMX lights directly to the desk to confirm operation of the light?

Have you shortened your DMX network to determine if there are any cable faults?

Has anyone else had access to the console and might have changed the patch?

Have you confirmed the patch has the lights in your rig patched and they are at the right DMX address?

Did you update firmware on any item of equipment in your network?