clear the CMOS memory; see “System-board switches and jumpers” on page 31. If you suspect that the server firmware is damaged, see “Recovering the server firmware” on page 152.

Check the LEDs on all the power supplies. If the LEDs indicate that the power supplies are working correctly, do the following:

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.

vAny external devices.

vSurge-suppressor device (on the server).

vModem, printer, mouse, and non-Lenovo devices.

vEach adapter.

vHard disk drives.

vMemory modules. The minimum configuration requirement is two 1 GB DIMM on the system board.

The following minimum configuration is required for the server to start:

vOne microprocessor

vOne 1 GB DIMM on the system board

vOne power supply

vPower cord

vServeRAID SAS/SATA adapter

vSystem board

4.Turn on the server. If the problem remains, suspect the following components in the following order:

a.Memory module

b.Microprocessor

c.System board

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 system board.

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.

Solving SCSI problems

Note: This information also applies to Serial Attached SCSI (SAS) problems.

For any SCSI error message, one or more of the following devices might be causing the problem:

vA failing SCSI device (adapter, drive, or controller)

vAn incorrect SCSI termination jumper setting

vA missing or incorrectly installed SCSI terminator

vA defective SCSI terminator

vAn incorrectly installed cable

vA defective cable

For any SCSI error message, follow these suggested actions in the order in which they are listed until the problem is solved:

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Lenovo 3836, 3809, 3826, 3724, 3824, 3808, 3815, 3817 manual Solving Scsi problems