Dell OptiPlex 990 (Early 2011) - Manual (Page 90)

Controls and Lights
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.
Network activity light on integrated
network adapter 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.
Power Wattage Maximum
Heat
Dissipation
Voltage
Mini-Tower 265 W 1390 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 5.0 A
Desktop 250 W 1312 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 4.4 A
Small Form
Factor 240 W 1259 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 3.6 A;
100 VAC to 240 VAC, 50 Hz to 60 Hz, 4.0 A
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