Dell OptiPlex 780 - Manual (Page 9)

Desktop
Small form factor
two 120-pin connectors
one 120-pin connector
PCI Express x1
Mini-tower
Desktop
Small form factor
data width (maximum) — one PCI Express
lane
one 36-pin connector
not applicable
not applicable
PCI Express x16 one 164-pin connector
data width (maximum) — 16 PCI Express
lanes
Serial ATA
Mini-tower
Desktop
Small form factor
four 7-pin connectors
three 7-pin connectors
three 7-pin connectors
Memory four 240-pin connectors
Internal USB device one 10-pin connector (supports two USB
ports)
Processor fan one 5-pin connector
Hard-drive fan one 5-pin connector
Front panel control one 40-pin connector
Processor one 775-pin connector
Power 12V one 4-pin connector
Power one 24-pin connector
Controls and Lights
Front of the computer
Power button push button
Power light blinking green — indicates that the
computer is in sleep state
solid green — indicates that the computer
is in power-on state
blinking amber — indicates a problem
with the system board
solid amber — indicates that the system
board is unable to initialize
Drive activity light blinking green — indicates that the
computer is reading data from or writing
data to the hard drive
Network connectivity light green — indicates that a good connection
exists between the network and the
computer
off (no light) — indicates that the
computer is not detecting a physical
connection to the network