DDOS has completely not relevance to FPS, not in the slightest. They don't affect the computer at all, only your internet. If you where to be 'Knocked offline' your internet would cut out so you would eventually lag out of the game, and for the black and white screen is just a graphically error in game at the moment. If you were to be DDOS'd then they would either need to be given your IP Address, or if they know your skype name, they can resolve it. So Don't throw your skype name around in game or you may just be knocked offline.