Dell OptiPlex 790 (Early 2011) - Manual (Page 89)

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
Ultra Small
Form Factor 200 W 758 BTU/hr 100 VAC to 240 VAC, 50 Hz to 60 Hz, 2.9 A
NOTE: Heat dissipation is calculated by using the power supply wattage rating.
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