my arduino uno board is not working 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
Computer shutting down is often an indication that excess power is being drawn.
If you measure  between +5 and Gnd on the unpowered board with a meter set for resistance, do you get a reading in the 5Kohm range? Or something much lower? Much lower would be bad.