Connect the USB cable to your 1490T and computer. Open windows explorer.
You should have a Garmin Nuvi drive listed. Select the .System folder (it's hidden), then the sqlite folder. You should see a file called mlg_history.db.
You can also do a search in the Garmin drive for the file.
Delete mlg_history.db It is almost certainly corrupted/damaged.
Disconnect the USB cable. Power on. The Nuvi should boot fast (like when it was new).
Enjoy your sounds and bluetooth connection. mlg_history.db will be automatically regenerated by the Nuvi.