Dell OptiPlex 780 Service Manual - Page 9

Controls and Lights, PCI Express x16 - memory

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Desktop Small form factor PCI Express x1 Mini-tower Desktop Small form factor PCI Express x16 Serial ATA Mini-tower Desktop Small form factor Memory Internal USB device Processor fan Hard-drive fan Front panel control Processor Power 12V Power Controls and Lights Front of the computer Power button Power light Drive activity light Network connectivity light two 120-pin connectors one 120-pin connector data width (maximum) - one PCI Express lane one 36-pin connector not applicable not applicable one 164-pin connector data width (maximum) - 16 PCI Express lanes four 7-pin connectors three 7-pin connectors three 7-pin connectors four 240-pin connectors one 10-pin connector (supports two USB ports) one 5-pin connector one 5-pin connector one 40-pin connector one 775-pin connector one 4-pin connector one 24-pin connector push button 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 blinking green - indicates that the computer is reading data from or writing data to the hard drive 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

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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