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Recovering the BIOS code
If the BIOS code has become damaged, such as from a power failure during a flash
update, you can recover the BIOS code using a BIOS flash diskette.
Note: You can obtain a BIOS flash diskette from one of the following sources:
Complete the following steps to recover the BIOS code:
10. Do not restart your server at this time.
11. Remove the BIOS flash diskette from the diskette drive.
12. Turn off the server and disconnect all power cords; then, remove the server
13. Remove the jumper from pins 2 and 3 of boot block recovery jumper (J28) and
14. Reconnect all external cables and power cords and turn on the peripheral
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.
A general procedure for troubleshooting power problems is as follows:
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
36
xSeries 235 Type 8671: Hardware Maintenance Manual and Troubleshooting Guide
v Use the ServerGuide program to make a BIOS flash diskette.
v Download a BIOS flash diskette from the World Wide Web. Go to
http://www.ibm.com/pc/support/, click IBM Server Support, and make the
selections for your server.
v Contact your IBM service representative.
1. Turn off the server and disconnect all power cords and external cables; then,
remove the server cover (see "Removing the left-side cover" on page 51).
2. Locate the boot block recovery jumper (J28) on the system board. See
"System-board switches and jumpers" on page 47 for jumper location.
3. Remove the jumper from pins 1 and 2 of boot block recovery jumper and place
it on pins 2 and 3 of the boot block recovery jumper to enable BIOS recovery
mode.
4. Insert the BIOS flash diskette into the diskette drive.
5. Reconnect all power cords; then, reinstall the server cover.
6. Restart the server. The system begins the power-on self-test (POST).
7. Select 1 - Update POST/BIOS from the menu that contains various flash
(update) options.
8. When prompted as to whether you want to save the current code to a diskette,
press N.
9. When prompted to choose a language, select a language (from 0 to 7) and
press Enter to accept your choice.
cover.
place it on pins 1 and 2 of the boot block recovery jumper to return to normal
startup mode.
devices; then, reinstall the server cover and restart the server. The system
starts.
example, if there is a loose screw causing a short circuit on a circuit board.
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