I took step 2 this morning. After my first block the power went out but the computers were still working. I did another 2 blocks and the entire computer system crashed. They took everyone out of the room and kept us for about 2 hours before they told us we all had to reschedule. NBME said they have to investigate whether or not they score the test or if I retake it. Does anyone know how much you need to complete for them to score the test?