Let me update this post, first thanks to everyone who helped me.
Second, i have a guy who changed the port by taking an old one from another nuvi, this was the old port
[Only registered and activated users can see links. ]

After that, i expected unit to work again, but no, it didn't. So we found another broken Nuvi and took that usb port and replaced the broken port with the second port, and again nothing. Then we changed the port of a perfectly fine nuvi with one of the usb ports that we tested on the device and it worked flawlessly, so the port was not the problem.

After a long talk about might changing the unit board, we found the device itself worked very good and it could operate if the map was loaded from an SD card as the internal storage is working perfect, but there is no way to put the voices on the nuvi as the PC cannot detect it. Is it possible to load the voices from the SD card? Or should i just burn it with fire so it cannot reproduce again? I'm just kidding but it has been a big head ache this GPS

Thanks to everyone and for reading this.