Dell OptiPlex 755 - Manual (Page 80)

Serial 9-pin connector; 16550C-compatible
Parallel 25-pin connector (bidirectional)
Video 15-pin VGA connector
Network adapter RJ45 connector
Optional PS/2 with secondary serial port
adapter two 6-pin mini-DINs
USB two front-panel and six back panel USB 2.0–compliant
connectors
Audio two connectors for line-in/ microphone and line-out;
two front-panel connectors for headphones and
microphone
System board connectors:
SATA three 7-pin connectors
eSATA one 7-pin connector
Internal USB 10-pin header for optional media card reader (in 3.5-
inch drive bay)
Floppy drive 34-pin connector
Serial 12-pin connector for optional secondary PS/2 serial
port card
Fan 5-pin connector
PCI Express one 120-pin (x16) connector
PCI 2.3 two 120-pin connectors
Front panel 40-pin connector
Key Combinations
in Microsoft® Windows® XP, brings up the Windows
Security window; in MS-DOS® mode, restarts
(reboots) the computer
or 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 start-up only)
or 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
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 1000-Mb (1-Gb)
operation
Activity light (on integrated network adapter) yellow blinking light
Diagnostic lights four lights on the front panel (See Diagnostic Lights .)
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, but the internal battery does
draw a minute amount of power from the power
supply even when the computer is not drawing
power from the AC power source.