After power was cut to one of my switches (thanks building maintenance) three phones would not boot. They start to boot but then only speaker light comes on and then nothing else. I tried using a power supply instead of PoE thinking perhaps the PoE negotiation got pooched. But no luck. I also tried holding down the # key during boot to get the phone to factory reset. But this also did not work. Does anyone know of some other knob I could try to turn to recover these phones before I send them off to e-waste??