I run into couple of problems when trying to print yesterday. Since someone may run into same problems, I decided to write some troubleshooting instructions. Problem was that printer didn’t seem to get any power. I checked that power cord was connected, atx power was on and the socket was working. I also checked that the ethernet socket I used was connected to Juniper router that provides PoE. It turned out that problem was missing PoE. Both ELL-i PoE board and Raspberry Pi has power leds, so if they are not on, most likely PoE is not working and you should try another ethernet socket. Since Raspberry Pi also controls soft power switch of ATX power source, printer will not get power either. Since laptop power source is connected to same socket, its power led can be checked to see, if the mains power is working.