I have an Arduino Due (made in Italy) which suddenly (after working nicely for some time) started a new behavior: If I connect it to my computer via USB it is recognized and connects. The "On"-led is turned on but gets darker within seconds until it's off and the connection breaks. This happens with both USB ports. The area around the usb ports gets hot and especially the "504L" next to the reset buttons. (I just have my finger to measure the temperature, so it could also be something else in this corner).
What could have happened to the board? And is there anything I can try to revive it?
Update: @GuitarPicker: It's the object labelled "0105" in your image, so it's probably the F1 fuse. If I connect the top USB, F1 gets hot, if I use the lower usb, F2 is activated.
There is nothing connected to the board. Before that, I used it to send SPI commands where I might have connected some of the SPI pins in the 6 pin group.
The board is placed on wood, so there should be no external connection
No smoke or visible damage.