Dell OptiPlex 755 User Manual page 245

Bus type
Bus speed
Drives
Internal/External
Connectors
External connectors:
Serial
Parallel
Video
Network adapter
USB
Audio
System board connectors:
SATA
Fan
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
Power supply status light
hard drive access light
Link integrity light (on integrated network adapter)
Activity light (on integrated network adapter)
Diagnostic lights
Standby power light
SATA 1.0a and 2.0;
USB 2.0
SATA: 1.5 and 3.0 Gbps;
USB: 480 Mbps
one D-module bay for an optical drive, second hard
drive, or floppy drive
one bay for a 3.5-inch hard drive
9-pin connector; 16550C-compatible
25-pin connector (bidirectional)
28-pin DVI connector
RJ45 connector
two front-panel and five back panel USB 2.0–
compliant connectors
two back panel connectors for line-in and line-out;
two front-panel connectors for headphones and
microphone
7-pin connector
one 3-pin and two 5-pin connectors
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 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 the power-on state.
amber light — Blinking amber indicates a problem
with an installed device; solid amber indicates an
internal power problem (See Power
green light — Solid green indicates the power
adapter is connected to an AC outlet and the
computer.
amber light — Solid amber indicates the power
adapter is connected to an AC outlet but not the
computer.
green
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 back panel (See
AUX_PWR on the system board
Problems.)
Diagnostic Lights.)