IBM eServer 240 xSeries User Reference Manual page 160

Controller problem
Ethernet Link Status light
does not light.
The Ethernet
Transmit/Receive Activity
light does not light.
Data is incorrect or sporadic.
The Ethernet controller
stopped working when
another adapter was added
to the server.
The Ethernet controller
stopped working without
apparent cause.
150
IBM xSeries User's Reference
Action
Check the following:
Make sure that the hub is turned on.
Check all connections at the Ethernet controller and the hub.
Check the cable. A crossover cable is required unless the hub
has an X designation.
Use another port on the hub.
If the hub does not support auto-negotiation, manually configure
the Ethernet controller to match the hub.
If you manually configured the duplex mode, make sure that you
also manually configure the speed.
Run diagnostics for the LEDs.
If the problem still exists, have the system serviced.
Check the following:
Note: The Ethernet Transmit/Receive Activity LED illuminates only
when data is sent to or by this Ethernet controller.
Make sure that you have loaded the network device drivers.
The network might be idle. Try sending data from this workstation.
Run diagnostics on the LEDs.
The function of this LED can be changed by device driver load
parameters. If necessary, remove any LED parameter settings
when you load the device drivers.
Check the following:
Make sure that you are using Category 5 cabling when operating
the server at 100 Mbps.
Make sure that the cables are not close to noise-inducing sources
like fluorescent lights.
Check the following:
Make sure that the cable is connected to the Ethernet controller.
Make sure that your PCI system BIOS is current.
Reseat the adapter (see "Working with adapters" on page 53).
Determine if the interrupt (IRQ) setting assigned to the Ethernet
adapter is also assigned to another device in the
Configuration/Setup Utility program.
Although interrupt sharing is allowed for PCI devices, some
devices do not function well when they share an interrupt with a
dissimilar PCI device. Try changing the IRQ assigned to the
Ethernet adapter or the other device. (See "Resolving
configuration conflicts" on page 151.)
If the problem still exists, have the system serviced.
Check the following:
Run diagnostics for the Ethernet controller.
Try a different connector on the hub.
Reinstall the device drivers. Refer to your operating-system
documentation and to the ServerGuide topic.
If the problem still exists, have the system serviced.