Sounds as if you may have a corrupt file system. If you have an SD card, take it out and see if that helps. If it doesn't help (or you don't have an SD card) see if it mounts via USB (if it gets to the screen with the three dots on it should do). Do a "chkdsk" of the internal file system. If you get errors, make a backup of the "system" folder, reformat the internal disk (to FAT32) then put back the "system" folder.
If all else fails, reflash the ROM.
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