Dell OptiPlex 755 User Manual
Page 177
<F3>
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)
<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
<Ctrl><p>
displays the Management Engine BIOS Extension
settings screen that allows you to modify the settings
Controls and Lights
Power control
push button
Power light
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 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 front panel (See
Dell Diagnostics
.)
Standby power light
AUX_PWR on the system board
Power
DC power supply:
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.
Wattage
275 W
Heat dissipation
938 BTU/hr
NOTE:
Heat dissipation is calculated based upon the
power supply 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
9.26 cm (3.65 inches)
Width
31.37 cm (12.35 inches)
Depth
34.03 cm (13.40 inches)
Weight
7.4 kg (16.4 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: