there is a compatible cartridge in machine that works in an identical machine. I also tried another cartridge still the same message "Install Black Cartridge" I called HP they said it was the pickup device that makes contact with the drum. That part is not available. I removed the pickup device and checked it out, visual and electrically. It is working as it should. I cleaned the contacts on it as well. I have replaced both the formatter and the dc controller board, I have reset the nvram over and over. Just for kicks I removed the laser and checked it out too, all is ok. The drum drive does not turn but I am assuming it is because it sees no cartridge. At the moment I cant seem to figure it out, but I will keep after it, in the meantime does anybody have a similar situation happen to them and resolve it?
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