Lenovo THINKSERVER 3821 - Manual (Page 132)

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 light 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 75.
Damaged data in CMOS memory or damaged Lenovo ThinkServer Server
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 “Internal LEDs, connectors, and jumpers” on page 140.
Check the LEDs on all the power supplies (see “Power-supply LEDs” on page 88).
If the LEDs indicate that the power supplies are working correctly, complete the
following steps:
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.
v Memory modules. The minimum configuration requirement is 1 GB DIMM per
microprocessor (2 GB in a two-microprocessor configuration).
The following minimum configuration is required for the server to start:
v
One microprocessor
v One 1 GB DIMM
v One power supply
v Power cord
v ServeRAID SAS adapter
v System board assembly
124 ThinkServer TD200x Types 3719, 3821, 3822, and 3823: Hardware Maintenance Manual