mono 554e no display

[tech51]

I have a 554e with no display on the ops panel.
The fans are running but the light on the sub power switch isn't on and the display is blank.
I have so far tried a new display, mfp board and memory and checked the power supply voltages but the machine still wont boot up.
I have tried starting it with the HDD disconnected but again no boot.
Has anyone experienced this before?

[Synthohol]

When you replaced the MFP board you still had no display at all?
Pull the ssd board off and try to boot. You should get at least 2 pillars and at least you will know the display works.
Replacing the MFP board is a detailed time killing process. Did you try to boot to a firmware stick?

[copyman]

Good advice from Synthohol. First thing you need to do is see if control panel is working. I've had a few go bad and stay black. You have to at least get to the point of pillars showing.

[Brett GS]

Does your machine have a dual scan board?
If it does remove it completly off of the mfp board and turn machine on,if it boots up and goes into error then you have a faulty dual scan board.
I have had this issue on a B654e.