Well I've got NUVI350 LMT. Went to install the new maps yesterday and it failed. Now when I plug in the GPS to my computer(WIN7 64bit) it boots, I see the Garmin screen. The little green loading bar goes about 1mm then the system reboots completely.

I was able to get the information G7Towin NUVI 13xx series software version 5.40. ID972

However I cant see it as a mass storage device. I can't seem to get it stay in the pre-boot mode. When I hold the top left screen during power up I see a quick 1 or 2 second white screen which appears to be the screen calibration but it goes away before I can identify it.

Do I need to send this in to get it fixed or is there something I can do here to rectify the situation?

Really kind of annoying. It told me to update the firmware then the maps, now I'm stuck with a GPS that just cycles on, 'crashes',reboots then crashes.

Can anyone send me some advice?