Dell OptiPlex GX520 - Page 156

<F2> or <Ctrl><Alt><Enter>
starts embedded system setup (during system start-
up only)
<Ctrl><Alt><b>
automatically starts the computer from the network
environment specified by the remote boot
environment (PXE) rather than from one of the
devices in the system setup Boot Sequence option
(during system start-up only)
<F12> or <Ctrl><Alt><F8>
displays a boot device menu that allows the user to
enter a device for a single boot (during system start-
up only) as well as options to run hard-drive and
system diagnostics

Controls and Lights
Power control
push button
Power light
green light — Blinking green indicates a sleep mode;
solid green indicates a power-on state.
amber light — Blinking amber indicates a problem
with an installed device; solid amber indicates an
internal power problem (see "Power Problems").
Hard-drive access light
green
Link light
solid green light indicates network connection
Link integrity light (on integrated network adapter)
green light for 10-Mb operation; orange light for 100-
Mb operation; yellow light for a 1000-Mb (1-Gb)
operation
Activity light (on integrated network adapter)
yellow blinking light
Diagnostic lights
four lights on the back panel (see "Diagnostic Lights")
Standby power light
AUX_PWR on the system board

Power
DC power supply:
Wattage
220 W
Heat dissipation
751 BTU/hr
NOTE: Heat dissipation is calculated based upon the
power supply wattage rating.
Voltage
manual selection power supplies — 90 to 135 V at
50/60Hz;180to265Vat50/60Hz
Backup battery
3-V CR2032 lithium coin cell

Physical
Height
11.4 cm (4.5 inches)
Width
39.9 cm (15.7 inches)
Depth
35.3 cm (13.9 inches)
Weight
10.4 kg (23 lb)

Environmental
Temperature:
Operating
10°to35°C(50°to95°F)
Storage
–40°to65°C(–40°to149°F)
Relative humidity
20% to 80% (noncondensing)
Maximum vibration:
Operating
0.25 G at 3 to 200 Hz at 0.5 octave/min
Storage
0.5 G at 3 to 200 Hz at 1 octave/min
Maximum shock:
Operating
bottom half-sine pulse with a change in velocity of
50.8 cm/sec (20 inches/sec)
Storage
27-G faired square wave with a velocity change of
508 cm/sec (200 inches/sec)
Altitude:
Operating
–15.2 to 3048 m (–50 to 10,000 ft)
Storage
–15.2 to 10,668 m (–50 to 35,000 ft)