iphone 17 completely dead, won't turn on

Try a force restart: press and let go of volume up, press and let go of volume down, then hold the side button. Keep holding even if nothing happens for a while, you let go when the apple logo shows up. It can take a good 15-20 seconds and most people let go too early. If that does nothing, leave it on a different cable and charger for half an hour before trying again. A phone that ran completely flat can sit on a black screen for a bit before it shows anything. Still dead after that, it's an Apple store job.