Depending on the corresponding order you and your friends press the PS button in the middle of your PS4 DualShock controller, ...
then press the controller reset button, plug in the USB cable, turn the PS4 on, and once the blue light flashes, press the PS button on the controller. If neither of those two methods resurrect ...
You never know when you're going to need an extra PS4 controller. Maybe yours broke, or you're looking to add player two, or you just want to add a splash of color to your gaming life. Over the ...