Dell OptiPlex 755 User Manual page 177

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<F12> or <Ctrl><Alt><F8>
<Ctrl><p>
Controls and Lights
Power control
Power light
hard drive access light
Link light
Link integrity light (on integrated network adapter)
Activity light (on integrated network adapter)
Diagnostic lights
Standby power light
Power
DC power supply:
Wattage
Heat dissipation
Voltage
Backup battery
Physical
Height
Width
Depth
Weight
Environmental
Temperature:
Operating
Storage
Relative humidity
Maximum vibration:
Operating
Storage
Maximum shock:
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 startup only)
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
displays the Management Engine BIOS Extension
settings screen that allows you to modify the settings
push button
green light — blinking green indicates sleep mode;
solid green indicates power-on state.
amber light — blinking amber indicates a problem
with an installed device; solid amber indicates an
internal power problem (See Power
green
solid green light indicates network connection
green light for 10-Mb operation; orange light for 100-
Mb operation; yellow light for a 1000-Mb (1-Gb)
operation
yellow blinking light
four lights on the front panel (See
AUX_PWR on the system board
NOTE: Power consumption from an AC power source
can be zero when the computer is unplugged from
that power source. However, the computer draws
minimal power from the internal coin cell battery even
when the computer is not drawing power from the AC
power source.
275 W
938 BTU/hr
NOTE: Heat dissipation is calculated based upon the
power supply rating.
manual selection power supplies — 90 to 135 V at
50/60 Hz; 180 to 265 V at 50/60 Hz
3-V CR2032 lithium coin cell
9.26 cm (3.65 inches)
31.37 cm (12.35 inches)
34.03 cm (13.40 inches)
7.4 kg (16.4 lb)
10° to 35°C (50° to 95°F)
–40° to 65°C (–40° to 149°F)
20% to 80% (noncondensing)
0.25 G at 3 to 200 Hz at 0.5 octave/min
0.5 G at 3 to 200 Hz at 1 octave/min
Problems.)
Dell Diagnostics.)