No, I did not format it. I just was writing files into its internal memory (no onto SD), then there has been a short outage. After it I have an almost break on my hands

If I have USB cable plugged in, nuvi starts booting, shows connection icon (white tower linked with navigator), then it appears in the windows explorer as a drive. But drive is empty. Completely. No .System, nothing.

If I start it without cable, it shows splashscreen "Garmin" forever