iPod Nano 3G Won't boot up

So. I have an iPod 3g 8GB.

One day it get stucked on the apple logo and it doesn't do anything.

I've tried to get on the disk mode and it doesn't respond, I've tried to enter the diagnostics and much as same as the disk mode.

But if i connect the iPod to my PC and let the menu + select button for like 20 seconds, the screen turns off and the PC recognices my iPod. In the iPod screen doesn't shows up anything but the PC recognices it. Is like a strange disk mode but with another combination of buttons pressed.

The PC recognices the iPod only for a few seconds and then iTunes gives me the "2005" error or sometimes it shows the recovery menu but the "1675" error shows up saying the iPod couldn't be detected.

Anyone knows what is going on here?