Controls and Lights

see the Service Manual at support.dell.com/manuals.

Back of the computer:

Link integrity light on integrated network adapter

Network activity light on integrated network adapter

Green — a good 10 Mbps connection exists between the network and the computer.

Orange — a good 100 Mbps connection exists between the network and the computer.

Yellow — 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.

Power supply diagnostic light

Green light — The power supply is

 

turned on and is functional. The

 

power cable must be connected to

 

the power connector (at the back

 

of the computer) and the electrical

 

outlet.

 

NOTE: You can test the health

 

of the power system by

 

pressing the test button. When

 

the system power supply

 

voltage is within specification,

 

the self-test LED lights up. If the

 

LED does not light up, the

 

power supply may be defective.

 

AC power must be connected

 

during this test.

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Dell 990 Turned on and is functional, Outlet, Power system by, System power supply, LED does not light up, 100