Dell OptiPlex 755 Quick Reference Manual page 38

power button
2
3 Dell badge
LAN indicator
4
light
5 diagnostic lights
hard drive
6
activity light
38
Quick Reference Guide
Press 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.
Can be rotated to match the orientation of your computer.
To rotate, place fingers around the outside of the badge,
press firmly, and turn the badge. You can also rotate the
badge using the slot provided near the bottom of the
badge.
Indicates that a LAN (local area network) connection is
established.
Use the lights to help you troubleshoot a computer
problem based on the diagnostic code. For more
information, see "Diagnostic Lights" on page 66.
This light flickers when the hard drive is being accessed.