Dell OptiPlex 780 SFF Setup And Features Information Tech Sheet page 8

Drives (continued)
Internally accessible:
3.5-inch SATA drive bays
Available devices:
2.5-inch SATA hard drive
(with brackets)
3.5-inch SATA hard drive
19-in-1 Media Card Reader
5.25-inch SATA DVD-ROM,
DVD+/-RW, or DVD/CDRW
combo drive
Control Lights and Diagnostic Lights
Power button light
Drive activity light
Network connectivity light
Diagnostic lights
Mini-Tower — two
Desktop and Small Form Factor — one
Mini-Tower, Desktop, and Small Form Factor — two
Mini-Tower — two
Desktop and Small Form Factor — one
Mini-Tower and Desktop — one
Small Form Factor — one (slimline drive)
Mini-Tower — two
Desktop — one
Small Form Factor — one (slimline drive)
Green light — Solid green light indicates power-on state;
blinking green 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.
Green light — Blinking green light indicates that the computer
is reading data from or writing data to the hard drive.
Green 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.
Four lights located on the front panel of the computer.
For more information on the diagnostic lights, see the Service
Manual available on the Dell Support website at
support.dell.com/manuals.