Solving Undetermined Problems - Lenovo System x3630 M4 Installation And Service Manual

The method that you use to test the Ethernet controller depends on which operating system you are using.
See the operating-system documentation for information about Ethernet controllers, and see the Ethernet
controller device-driver readme file.
Try the following procedures:
• Make sure that the correct device drivers, which come with the server are installed and that they are at
the latest level.
• Make sure that the Ethernet cable is installed correctly.
– The cable must be securely attached at all connections. If the cable is attached but the problem
remains, try a different cable.
– If you set the Ethernet controller 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.
• 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.
• 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 is off, make sure that the hub and
network are operating and that the correct device drivers are installed.
• Check for operating-system-specific causes of the problem.
• 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 Dynamic System Analysis (DSA) cannot diagnose the failure or if the server is inoperative, use the
information in this section to solve the undetermined problems.
If you suspect that a software problem is causing failures (continuous or intermittent), see "Power problems"
on page 152.
Corrupted data in CMOS memory or corrupted UEFI firmware can cause undetermined problems. To
reset the CMOS data, use the CMOS jumper to clear the CMOS memory and override the power-on
password; see "System-board jumpers" on page 31. If you suspect that the UEFI firmware is corrupted,
see "Recovering the server firmware" on page 158.
If the power supplies are working correctly, complete the following steps:
Step 1. Turn off the server.
Step 2. Make sure that the server cover is closed and latched correctly.
Step 3. Make sure that the server top cover/power cut-off switch cable is connected correctly.
Step 4. Make sure that the server is cabled correctly.
Step 5. Remove or disconnect the following devices, one at a time, until you find the failure. Turn on the
server and reconfigure it each time.
• Any external devices.
• Surge-suppressor device (on the server).
• Printer, mouse, and non-Lenovo devices.
156
Lenovo System x3630 M4 Installation and Service Guide