mysqld fails to start after system reboot

[Jim Adam]

Everything was working fine, then I did a reboot, now the service won't start.

I tried creating a my.ini file, and began using the command line shown below, based on a Stack Overflow post, to try and get some idea of why the service won't start. I added a datadir line to the my.ini, pointing to my data directory. Added "NETWORK SERVICE" to the permissions list.... So far, nothing seems to make it happy.

System: Windows 10, MySQL 8.0.13.

mysqld --defaults-file="C:\Program Files\MySQL\MySQL Server 8.0\my.ini" --standalone --console
2018-12-31T16:37:01.590882Z 0 [System] [MY-010116] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe (mysqld 8.0.13) starting as process 1364
2018-12-31T16:37:01.904370Z 1 [ERROR] [MY-011011] [Server] Failed to find valid data directory.
2018-12-31T16:37:01.909568Z 0 [ERROR] [MY-010020] [Server] Data Dictionary initialization failed.
2018-12-31T16:37:01.914044Z 0 [ERROR] [MY-010119] [Server] Aborting
2018-12-31T16:37:01.918753Z 0 [System] [MY-010910] [Server] C:\Program Files\MySQL\MySQL Server 8.0\bin\mysqld.exe: Shutdown complete (mysqld 8.0.13) MySQL Community Server - GPL.