Last night I checked the extruder settings and, sure enough, the target temp was set to 2 but the extruder temp showed as 1 even without any thermistor attached. I changed the setting for target temp to 0 and the whole machine started working just fine. It was very exciting to watch it go through the motions of printing a frame vertex. I took some video but I have not been able to get it to upload to Blogger. I am trying to reduce the size and convert it to other formats but no luck so far. I may try uploading it to YouTube first.