Dell OptiPlex 780 Setup and Features Information Tech Sheet (Ultra Small Fo - Page 6

Control Lights and Diagnostic Lights Front of computer: Power button light Drive activity light Network activity light WiFi activity light (optional) Diagnostic lights Back of computer: Link integrity light on integrated network adapter Network activity light on integrated network adapter Blue light - Solid blue light indicates power-on state; blinking blue light indicates sleep state of the computer. Amber light - Solid amber light when the computer does not start indicates a problem with the system board or power supply. Blinking amber light indicates a problem with the system board. Displays the SATA hard drive or CD/DVD drive activity. Blue light - Blinking blue light indicates that the computer is reading data from or writing data to the drive. Blue light - A good connection exists between the network and the computer. Off (no light) - The computer is not detecting a physical connection to the network. Blue light - The WiFi network card is enabled. Four amber lights located on the front panel of the computer. For information on the diagnostic lights, see the Service Manual available on the Dell Support website at support.dell.com/manuals. Green light - A good 10 Mbps connection exists between the network and the computer. Orange light - A good 100 Mbps connection exists between the network and the computer. Yellow light - A good 1000 Mbps connection exists between the network and the computer. Off (no light) - The computer is not detecting a physical connection to the network. Yellow light - A blinking yellow light indicates that network activity is present.