mks gen 1.4 board fried and kill laptop hard drivve

i hooked up laptop to mks gen 1.4 and connect it to 24 v 15 A power supply. after one or two minutes c2 capacitor burn and light up! i disconnect power supply cable and usb. laptop hard driver busted. mks turn on by 5v on usb and lcd go deem after maarlin loads up. i connected 24 v again just to make sure, boadr run and c2 start smoking and burning the same time. stepper motor wire was connected whiteout stepper drivers, bed and nozzle heater was connected, and lcd was connected.