Oh okay. So the shaft is not supposed to extend all the way. I had not removed it yet. The problem is that the impeller itself was stuck I guess -- I should be able to turn the prop by hand right? The symptom was that the powerhead had stopped. The power supply had power. I tried swapping control cables which didn't help. I opened up the power head and found I could not turn the impellor by hand which with other brands only happens when it is stuck. I had a hard time getting the impellor out, it seemed to be back inside there a ways, and the impellor shaft did not come out (now I see that is okay but thought the shaft was broken). Any ideas about this? I guess I should reinstall the clean impellor and try again but it didn't seem gunky at all either. Other ideas? I purchased from Premium Aquatics on 6/5/2012.