Dell Precision 490 - Manual (Page 3)

Back View (Tower Orientation)
Back Panel Connectors
¡ No light — The computer is turned off or in a hibernation
mode.
¡ Steady green — The computer is in a normal operating
state.
¡ Blinking green — The computer is in a power-saving state.
¡ Blinking or solid amber — See Power Problems .
To exit from a power-saving state, press the power button or use the
keyboard or the mouse if it is configured as a wake device in the
Windows Device Manager. For more information about sleep states and
exiting from a power-saving state, see
Power Management .
See Diagnostic Lights for a description of light codes that can help you
troubleshoot problems with your computer.
10 headphone
connector
Use the headphone connector to attach headphones.
11 microphone
connector
Use the microphone connector to attach a personal computer
microphone for voice or musical input into a sound or telephony
program.
12 network link
light
The network link light is on when a good connection exists between a
10-Mbps, 100-Mbps, or 1000-Mbps (or 1-Gbps) network and the
computer.
13 diagnostic
lights (4)
Use these lights to help you troubleshoot a computer problem based on
the diagnostic code. For more information, see
Diagnostic Lights .
1 power
connector
Insert the power cable.
2 card slots Access connectors for any installed PCI, PCI-X, or PCI Express cards.
NOTE: The center four slots support full-length cards: one PCI-X slot, one
PCI Express x8 slot (wired as x4), one PCI Express x16 slot, and one PCI
slot); and the top and bottom slots support half-length cards: one PCI-X
slot and one PCI Express x8 slot (wired as x4).
3 back panel
connectors
Plug serial, USB, and other devices into the appropriate connector (see
Back Panel Connectors ).