System Board Connectors - Dell OptiPlex 755 User Manual

Serial
Parallel
Video
Network adapter
Optional PS/2 with secondary serial port
adapter
USB
Audio

System board connectors:

SATA
eSATA
Internal USB
Floppy drive
Serial
Fan
PCI Express
PCI 2.3
Front panel
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:
9-pin connector; 16550C-compatible
25-pin connector (bidirectional)
15-pin VGA connector
RJ45 connector
two 6-pin mini-DINs
two front-panel and six back panel USB 2.0–compliant
connectors
two connectors for line-in/ microphone and line-out;
two front-panel connectors for headphones and
microphone
three 7-pin connectors
one 7-pin connector
10-pin header for optional media card reader (in 3.5-
inch drive bay)
34-pin connector
12-pin connector for optional secondary PS/2 serial
port card
5-pin connector
one 120-pin (x16) connector
two 120-pin connectors
40-pin connector
in Microsoft® Windows® XP, brings up the Windows
Security window; in MS-DOS® mode, restarts
(reboots) 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 start-up 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 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
green
solid green light indicates network connection
green light for 10-Mb operation; orange light for 100-
Mb operation; yellow light for 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, 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.
Problems.)
Diagnostic Lights.)