I charged the my primary Corne half last night for the first time in several months. Today, it does not appear to turn on — if I either turn on the power switch or plug in power, the nice!view shows noise (i.e. a sparse random pattern of black dots), but it never resolves into the normal screen function (the fact this happens with no power cord says to me that it is properly getting power from the battery). I also do not appear to be able to enter it into the bootloader via double-tapping the reset button (have not tried the jumper option), which makes me suspect it may be a deeper issue with the nice!nano rather than just a non-functioning display.
Any tips for how to diagnose this further?