IBM System x3690 X5, Service Manual

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Check the LAN activity LED 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.
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Check for operating-system-specific causes of the problem.
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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) 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 66.
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
switches and jumpers” on page 21. If you suspect that the UEFI firmware is
corrupted, see “Recovering from a UEFI update failure or UEFI image corruption”
on page 164.
If the power supplies are working correctly, complete the following steps:
1. Turn off the server.
2. Make sure that the server cover is closed and latched correctly.
3. Make sure that the server top cover/power cut-off switch cable is connected
correctly.
4. Make sure that the server is cabled correctly.
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.
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Any external devices.
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Surge-suppressor device (on the server).
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Printer, mouse, and non-IBM devices.
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Each adapter.
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Hard disk drives.
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Memory modules. The minimum configuration requirement is 1 GB DIMM
in slots 3.
6. Turn on the server.
If the problem is solved when you remove an adapter from the server but the
problem recurs when you reinstall the same adapter, suspect the adapter; if the
problem recurs when you replace the adapter with a different one, suspect the riser
card.
If you suspect a networking problem and the server passes all the system tests,
suspect a network cabling problem that is external to the server.
Chapter 3. Diagnostics
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