drluckyspin

After following these instructions I get nothing. I: Wrote `sdcard_arm64.img` to SD card Made jumpers were ON, OFF, ON, ON Put in power All I see is the red LED on on the board. The heat sink fan is spinning. My attached monitor did flick to black from "No input" but there is no output whatsoever. No console or boot output. How do I diagnose what is wrong?