I received this printer from my dad's workplace recently and I have been trying to get it to work. It turns on and stuff, but when I try to load filament into it, it just stays at the "Please remove CubeTube from top of printer jet" screen, and the tip never gets hot. There is filament in the print head and it is stuck there, so it would seem that the only way to remove it now is to get the tip hot, but it never does that no matter what I do. From what I can tell, the only problem is the extruder tip never heats up. I have taken it apart, and all the wires seem to be connected. There is some discoloration of the heating coil near the top, but I assume that is normal.

I have not been able to find a solution myself, so I came here for help. Any tips you can provide would be greatly appreciated.