Dell OptiPlex 755 User Manual page 178

Key Combinations
<Ctrl><Alt><Del>
<F2> or <Ctrl><Alt><Enter>
<F3>
<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
178
Small Form Factor Computer Specifications
If you are running Microsoft
Windows Security window; in MS-DOS
the computer
starts embedded system setup (during system start-up only)
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 Problems" on page 339.)
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 "Dell Diagnostics" on page 353.)
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
® ®
Windows XP , brings up the
®
mode, restarts (reboots)