I have a customer with the 3570, it turns on & goes through all the cycles but won't copy or print. The green light on the panel is on but the display is dead. Usual repair for this is disconnect & reconnect the Ram or the Boot Rom which does not work. I tried reconnnecting the HDD, counter chip & all connections to every board. I then tried disconnection all the connections to the main controller board execpt those to the power board and the controll panell, it still cycles but the display is dead although the green power light is on. Everthing points to the main control board. Does anyone have a solution before I get antoher main control board. Thanx. Phil.