Controles de los diagnósticos del sistema.............................................................................................................1398 Puentes y conectores.................................................................................................................................140System board jumpers and connectors....................................................................................................................... 140Configuración del puente de la placa base................................................................................................................... 141Desactivación de una contraseña olvidada..................................................................................................................1429 Solución de problemas del sistema............................................................................................................. 143Seguridad para el usuario y el sistema......................................................................................................................... 143Solución de problemas de error de inicio del sistema.................................................................................................143Solución de problemas de las conexiones externas....................................................................................................144Troubleshooting the video subsystem..........................................................................................................................144Troubleshooting a USB device...................................................................................................................................... 144Troubleshooting a serial input and output device....................................................................................................... 145Troubleshooting a NIC....................................................................................................................................................145Troubleshooting a wet system...................................................................................................................................... 145Troubleshooting a damaged sistema............................................................................................................................ 146Troubleshooting the sistema battery............................................................................................................................ 147Troubleshooting power supply units............................................................................................................................. 147Solución de problemas de fuente de alimentación............................................................................................... 147Problemas de la unidad de fuente de alimentación.............................................................................................. 147Solución de problemas de refrigeración.......................................................................................................................148Troubleshooting cooling fans.........................................................................................................................................149Troubleshooting system memory..................................................................................................................................149Troubleshooting an internal USB key........................................................................................................................... 150Troubleshooting a micro SD card..................................................................................................................................150Troubleshooting an optical drive....................................................................................................................................151Troubleshooting a drive or SSD..................................................................................................................................... 151Troubleshooting a storage controller............................................................................................................................152Troubleshooting expansion cards..................................................................................................................................152Troubleshooting processors.......................................................................................................................................... 153Mensajes del sistema..................................................................................................................................................... 153Mensajes de aviso.................................................................................................................................................... 153Mensajes de diagnóstico......................................................................................................................................... 154Mensajes de alerta................................................................................................................................................... 15410 Obtención de ayuda.................................................................................................................................. 155Cómo ponerse en contacto con Dell............................................................................................................................155Comentarios sobre la documentación......................................................................................................................... 155Acceso a la información del sistema mediante QRL.................................................................................................. 155Contents 7