Lenovo System x3750 M4, Installation And Service Manual

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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
Use this information to solve 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 195.
Corrupted data in CMOS memory or corrupted UEFI firmware can cause undetermined problems. To
reset the CMOS data, use switch 2 on the SW7 switch block to clear the CMOS memory and override
the power-on password; see Table 3 “System-board SW7 switch block descriptions” on page 31. If you
suspect that the UEFI firmware is corrupted, see “Recovering from a UEFI update failure or UEFI image
corruption” on page 199.
If the power supplies are working correctly, complete the following steps:
Step 1. Turn off the server.
Step 2. Make sure that the server is cabled correctly.
Step 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.
• Any external devices.
• Surge-suppressor device (on the server).
• Printer, mouse, and non-Lenovo devices.
• Each adapter.
• Hard disk drives.
• Memory modules. The minimum configuration requirement is one 4 GB DIMM in slot 1.
Step 4. 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, try a different PCIe slot.
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.
Problem determination tips
Because of the variety of hardware and software combinations that you can encounter, use the information
in this section to assist you in problem determination.
The model number and serial number are located on the ID label on the front of the server as shown in
the following illustration.
Note: The illustrations in this document might differ slightly from your hardware.
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Lenovo System x3750 M4 Installation and Service Guide