@ esfranky

First please answer this questions:

1. What did you do last to the nuvi to reach that condition? This is really very important. Did you format your nuvi for example in NTFS? Did you copy maps, POI etc in its memori.? Did you update its firmware? Be specific please. (Hope I understand your comment correct - nuvi reboots when turned on and not possible to be connected to PC. But when an SD card is pulled in it boots normal but still not possible to be connected to PC. Am I correct?)

2. Which firmware is using your nuvi? Which HwId? 1091 or 827?

3. What steps did you try to recover your nuvi?

I have an idea but please first answer this questions.