Dell PowerEdge 750 - Manual (Page 9)

Table 1-1. Front-Panel LED Indicators
Connecting External Devices
When connecting external devices to your system, follow these guidelines:
l Most devices must be connected to a specific connector and device drivers must be installed before the device operates properly. (Device drivers are
normally included with your operating system software or with the device itself.) Check the documentation that accompanied the device for specific
installation and configuration instructions.
l Always attach external devices while your system is turned off. Next, turn on any external devices before turning on the system (unless the
documentation for the device specifies otherwise). If the system does not appear to recognize the device, try turning on the system before turning on
the device.
For information about individual connectors, see "I/O Connectors" in your Installation and Troubleshooting Guide. For information about enabling, disabling, and
configuring I/O ports and connectors, see "
Using the System Setup Program ."
Back-Panel Features
Figure 1 -2 shows the back-panel features of the system.
Figure 1-2. Back-Panel Features
LED Indicator Description
Blue/amber system status
indicator
The blue system status indicator lights up during normal system operation. You can also use the systems management
software to cause this indicator to flash to identify a particular system.
The amber system status indicator flashes when the system needs attention due to a system problem.
Hard-drive indicator The green hard-drive activity indicator flashes when the hard drives are in use.
NIC1 and NIC2 link
indicators
The indicators for the two integrated network adapters light if the network adapters are connected to the network.
Power indicator The green indicator in the center of the power button flashes if AC power is available to the system, but the system is not
powered on.
The green indicator is on when the system is powered on.
If the system is not connected to AC power, the green indicator is off.