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laserjet 4650 dn - help - blank screen but printer warms up?

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hi,

i have a problem. when we switch on our printer the screen lights up but there is no memory count or anything else.

actions i have tried

1. cant do a cold reset

2. cant do nvram reset

3. wont do an engine test

 

engine does its warm up cycle and fans are on.

is there a fault finding pattern on formatter lights?

do i get a new formatter?

or is it a fault wiv a low voltage pcb? or high voltage pcb?

 

its a duplex model be a shame to write it off

 

please help


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