6.Locate the CMOS recovery jumper (J19) on the I/O board. The following illustration shows the location of the jumper on the I/O board.

1 2 3

CMOS recovery jumper (J19)

7.Move the CMOS recovery jumper from pins 1 and 2 to pins 2 and 3.

8.Wait 60 seconds; then, return the CMOS recovery jumper to pins 1 and 2.

9.Replace fans 3 and 4.

10.Close the cover (see “Closing the cover” on page 111).

11.Connect the server to a power source, keyboard, monitor, and mouse.

12.Turn on the server. The EFI Boot Manager program starts.

13.Follow the instructions to erase the existing password or create a new password.

14.Select Save Settings, and press Enter.

Power checkout

Power problems can be difficult to solve. For example, a short circuit can exist anywhere on any of the power distribution buses. Usually a short circuit will cause the power subsystem to shut down because of an overcurrent condition.

Follow this general procedure for troubleshooting power problems:

1.Turn off the server, and disconnect all ac power cords.

2.Check for loose cables in the power subsystem. Also check for short circuits; for example, a loose screw might be causing a short circuit on a circuit board.

3.Remove adapters and disconnect the cables and power connectors to all internal and external devices until the server is at the minimum configuration required to start the server (see the note about minimum operating requirements on page 180).

4.Reconnect all ac power cords, and turn on the server. If the server starts successfully, replace adapters and devices one at a time until the problem is isolated. If the server does not start up from the minimal configuration, replace FRUs of the minimal configuration one at a time until the problem is isolated.

To use this method, it is important to know the minimum configuration required for a system to start (see the minimum configuration requirements at “Undetermined problems” on page 185).

74IBM xSeries 450 Type 8688: Hardware Maintenance Manual and Troubleshooting Guide

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IBM 8688 manual Power checkout