You need to pull out the user manual for the light.
The fixture it self has settings..so to turn the lamp on as soon as power comes on is a feature called "Lamp on Automatically"
The one fixture has this feature off, so you need to turn it on.
Another feature is lamp on off by DMX.. its a feature that needs to be turned on. when this feature is turned on your Light Jockey button should work if its configured correctly