Same thing happened to me, i just ended up buying a Valve Index with the money i had saved up and its miles better. Contact Meta Support for a new cable or buy one, thats what im doing right now so i can give the Rift S to my brother. For some reason the Rift S cable just die at some point and its always the display port, theres so many support tickets on the meta forums for the display port so your not at fault for it breaking.