need help Bizhub C550 shows lights when turned on but display is blank

[Kai360]

Bizhub C550 shows lights when turned on but display is blank and printer does not initialized doesnt do anything just lights up mainboard light is steady board next to it keeps flashing start button on the display stays red

[rrrohan]

I forgot to plug in that large silver connector by the network port back in after dismantling copier years ago and I got this symptom

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[allan]

Yea start tugging on connectors.

[Kai360]

thanks guys but doesnt work so next is to reload the firmware and this seems like it wont be easy

[femaster]

Bizhub C550 shows lights when turned on but display is blank and printer does not initialized doesnt do anything just lights up mainboard light is steady board next to it keeps flashing start button on the display stays red

If I remember correctly, on this model, you could get this symptom if one of the memory (RAM) sticks went bad. There should be 2 mounted to the board, swap them around. If the copier then boots up normally but you can't select anything on the touch screen (it is unresponsive) you have confirmed a bad stick of memory.