Why does the fan remain stationary? Is it just a matter of internal friction vs low N2 not producing enough force to spin it, or is there some mechanism in place to hold it?
It is indeed too much friction for not enough air going through the core engine. The PW1100G N1 Rotor System is quite hard to turn (you`ll need both Hands to turn it) while the N1 Systems of the CFM56 or V2500 for example could easily be turned by hand (or only 2 fingers).