Clearing Cmos; Power Checkout - IBM eServer xSeries 455 Type 8855 Hardware Maintenance Manual And Troubleshooting Manual

Clearing CMOS

Complete the following steps to set the CMOS recovery jumper:
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
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
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IBM xSeries 455 Type 8855: Hardware Maintenance Manual and Troubleshooting Guide
1. Review the safety information beginning on page 215.
Attention: When you handle static-sensitive devices, take precautions to
avoid damage from static electricity. For details about handling these devices,
see "Handling static-sensitive devices" on page 78.
2. Turn off the server and all attached devices.
3. Unplug the power cord, and disconnect all external cables.
4. Open the top cover (see "Opening the cover" on page 84).
5. Remove fans 3 and 4. For instructions, see "Replacing fan 3 or 4" on page
108.
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.
password.
example, a loose screw might be causing a short circuit on a circuit board.