at once, when i connect arduino uno to my computer, my computer shuts down, after that i cannot upload programs to my computer,the board is not working but the led is ON. Before this, i upload programs 4 to 5 times continuously. i upload program with no physical connections in arduino except motor shield which is also not connected to anything. i used three boards, all of them got damaged.
my computer's USB port and USB cable is in good codition. i already updated my drivers.
computer spec: dell inspiron 15 3567 windows10 x64 bit