Control Lights And Diagnostic Lights - Dell OptiPlex 780 Setup & Features Manual

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.