Dell OptiPlex 755 - Manual (Page 17)

Quick Reference Guide
17
3 3.5-inch drive
bay Can contain an optional floppy drive or optional media card
reader.
4 USB 2.0
connectors (2) Use the front USB connectors for devices that you connect
occasionally, such as joysticks or cameras, or for bootable
USB devices (see your online User’s Guide for more
information on booting to a USB device).
It is recommended that you use the back USB connectors
for devices that typically remain connected, such as printers
and keyboards.
5 LAN indicator
light This light indicates that a LAN (local area network)
connection is established.
6 diagnostic lights Use the lights to help you troubleshoot a computer problem
based on the diagnostic code. For more information, see
"Diagnostic Lights" on page 66.
7 power button Press this button to turn on the computer.
NOTICE:
To avoid losing data, do not turn off the
computer by pressing the power button. Instead,
perform an operating system shutdown. See
"Turning
Off Your Computer" on page 13 for more information.
NOTICE:
If your operating system has ACPI enabled,
when you press the power button the computer will
perform an operating system shutdown.