OK but we knew that one was booting. What about the other one.
You can push the button to the right of the OLED to show the processor status, you need to see an A, but you don't have one as you you can see the same thing in the web GUI, your database has not loaded.
So you will probably be lookung at restoring backups, unless your other processor boots.
If Assistant is running, it might be worth checking Backup Restore for any backups saved to HD, Buffer or SFTP server, and letting it make a restore, and also in Configuration Management under HIM, maybe you have an RMX backup (regen). That's harder to restore though.