Por que la pantalla se oscurece, solo escucho el sonido al momento de iniciar el juego

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Mi pc con las característica Dc2 2.8ghz, DD250GB, 2GBR y T grafica 512mb, recientemente le instale call of duty 4, corrió bien después de haberlo instalado, luego al reiniciar mi pc, quise volver a jugar y no me da imagen, solo escucho el sonido de inicio del juego,

¿quien me puede decir cual es  la solución de este problema? .  Gracias de antemano