We picked up a Bizhub 600 for next to nothing (pulled from a UPS store). When we first got it back to the shop and powered it on, all it would do is state "Please Insert Plug-In Counter". I was able to solve that by going into Service Mode and disabling the key counter. Everything seemed fine up until I went to make a test copy.
When I make a copy, it does everything like it is suppose to - except actually print the copy. It will scan the original (either from the glass or the ADF) and put it into the queue with the status of "printing" but nothing ever happens, nothing fires up, it just does nothing.
However, I can go into service mode and make demo pages all day - those print and look fine. So my guess is that it has to be some security setting somewhere in the machine. I thought I would ask EE before I call in a tech to take a look.