I searched out knowledgebase, and found that you need to make sure the RAM is seated properly. The full steps are listed HERE. I know you said the engineer told you to leave it out previously, but have you tried re-installing it to clear the error?
If you tried that and it didn't work, you may need to speak to our Support Department. The Support options for your device are listed HERE .
Thanks, CathyO-Xerox Community Manager
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Exact message on startup is: Controller Communication Error ----------------------------------------- error 117-313 Restart Printer
Multiple restats and disconnects not worked. Tried leaving power and cables unplugged for two days
Article says to try removing the added memory module. Problem: i bought that and used that. Long time ago had problem, and one of your techs said to remove it and leave it out, which i did.
Cannot do a reset of nic network interface card, or cannot reset nvram because pressing 'system' does nothing, stays at error screen. Tried holding 'system' button down and then turning on machine while holding it down for long time. same result
Can someone show me where/how to check all connections, to make sure is not a connection loose on the controller board.