– The cable must be securely attached at all connections. If the cable is attached
but the problem remains, try a different cable.
– If the Ethernet controller is set to operate at 100 Mbps, you must use
Category 5 cabling.
– If you directly connect two servers (without a hub), or if you are not using a
hub with X ports, use a crossover cable. To determine whether a hub has an X
port, check the port label. If the label contains an X, the hub has an X port.
v Determine whether the hub supports auto-negotiation. If it does not, try
configuring the integrated Ethernet controller manually to match the speed and
duplex mode of the hub.
v Check the Ethernet controller LEDs on the rear panel of the server. These LEDs
indicate whether there is a problem with the connector, cable, or hub.
– The Ethernet link status LED is lit when the Ethernet controller receives a link
pulse from the hub. If the LED is off, there might be a defective connector or
cable or a problem with the hub.
– The Ethernet transmit/receive activity LED is lit when the Ethernet controller
sends or receives data over the Ethernet network. If the Ethernet
transmit/receive activity LED is off, make sure that the hub and network are
operating and that the correct device drivers are installed.
v Check the LAN activity LEDs on the rear of the server. The LAN activity LED is
lit when data is active on the Ethernet network. If the LAN activity LED is off,
make sure that the hub and network are operating and that the correct device
drivers are installed.
v Check for operating-system-specific causes of the problem.
v Make sure that the device drivers on the client and server are using the same
protocol.
If the Ethernet controller still cannot connect to the network but the hardware
appears to be working, the network administrator must investigate other possible
causes of the error.
Solving undetermined problems
If the diagnostic tests did not diagnose the failure or if the server is inoperative,
use the information in this section.
If you suspect that a software problem is causing failures (continuous or
intermittent), see “Software problems” on page 100.
Damaged data in CMOS memory or damaged firmware can cause undetermined
problems. To reset the CMOS data, use the password switch 2 (SW4) to override
the power-on password and clear the CMOS memory; see “Locating parts on the
system board” on page 15.
Check the LEDs on all the power supplies. If the LEDs indicate that the power
supplies are working correctly, do the following:
1. Turn off the server.
2. Make sure that the server is cabled correctly.
3. Remove or disconnect the following devices, one at a time, until you find the
failure. Turn on the server and reconfigure it each time.
v Any external devices
v Surge-suppressor device (on the server)
v Modem, printer, mouse, and non-Lenovo devices
v Each adapter
v Hard disk drives
102 Installation and User Guide
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