Hi, I updated my Nuvi 3590LMT the other day via Garmin Express (Lifetime free Map), and now it won't boot up past the logo, when it reaches the logo it beeps, and switches itself off. I tried to reset it, but it refuses to do so, and beeps at the same point, as when trying to boot.
Any suggestions will be greatly appreciated.
Thanks.

Did you update software also, or only map?

Can you access the garmin memory? Try copying the map file ~/.system/gmapprom.img to pc and delete file from garmin, and see if it boots then.