Hi Mate, my apologies for the late post but did you ever workout what the issue was?
My HR36 has just started to display the same symptoms, i don't know where to look first, i think its something to do with the input card (MG) just because if i don't input anything the green tint goes away and the blue screen idle looks fine.
The other symptom it is some times it will randomly reset and i can hear a relay click as if i just turn on the set.