Dell PowerEdge 2550 - Manual (Page 47)

Yes. The interface cable must be replaced. See " Getting Help " for instructions on obtaining technical assistance.
No. Go to step 5.
5. Turn off the system and the serial device, and swap the device with a comparable working device.
For example, if you are troubleshooting a serial mouse, swap it with a serial mouse that you know is working properly.
6. Turn on the system and the serial device.
Is the problem resolved?
Yes. The serial device must be replaced. See " Getting Help " for instructions on obtaining technical assistance.
No. See " Getting Help " for instructions on obtaining technical assistance.
Troubleshooting a USB Device
If a system error message indicates a problem with the Universal Serial Bus (USB) ports or a device connected to the port does not function properly, perform
the following steps:
1. Enter the System Setup program, and check that the USB ports are enabled.
2. Turn off the system and any devices connected to the USB ports.
Are two USB devices connected to the system?
Yes. Go to step 3.
No. Go to step 5.
3. Disconnect the devices from both USB ports, and connect the malfunctioning device to the opposite port.
4. Turn on the system and the reconnected device.
Is the problem resolved?
Yes. The USB port may be defective. See " Getting Help " for instructions on obtaining technical assistance.
No. Go to step 5.
5. If possible, swap the interface cable that connects the device to the USB port with a known working cable.
Is the problem resolved?
Yes. The interface cable must be replaced. See " Getting Help " for instructions on obtaining technical assistance.
No. Go to step 6.
6. Turn off the system and the USB device, and swap the device with a comparable working device.
7. Turn on the system and the USB device.
Is the problem resolved?
Yes. The USB device must be replaced. See " Getting Help " for instructions on obtaining technical assistance.
No. See " Getting Help " for instructions on obtaining technical assistance.
Troubleshooting the Integrated NICs
If you encounter problems with one of the system's integrated network interface controllers (NICs), the following actions may help you to diagnose the
problem:
l Enter the System Setup program and confirm that the NICs are enabled.
See "Using the System Setup Program" in the User's Guide for instructions.
l Check the light-emitting diodes (LEDs) on the corners of the NIC connectors on the system's back panel (see Figure 6 -1 ).
Figure 6-1. NIC Connector