Dell OptiPlex 790 (Early 2011) - Manual (Page 90)

System Board Connectors
Front panel control
Mini-Tower, Desktop, Small Form
Factor one 34-pin connector
Ultra Small Form Factor one 20-pin connector
Desktop, Small Form Factor, Ultra
Small Form Factor two 2-pin connectors
Processor one 1155-pin connector
Processor Fan one 5-pin connector
Power connector
Mini-Tower, Desktop, Small Form
Factor one 34-pin connector
Ultra Small Form Factor none
Controls and Lights
Front of the computer:
Power button light 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.
Drive activity light Blue light — Blinking blue light indicates
that the computer is reading data from or
writing data to the hard drive.
Diagnostic lights Four lights located on the front panel of the
computer.
Back of the computer:
Link integrity light on integrated
network adapter Green — a good 10 Mbps connection exists
between the network and the computer.
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