Recovering from a BIOS update failure
If power to the server is interrupted while BIOS code is being updated, the server
might not restart correctly or might not display video. If this happens, complete the
following steps to recover:
1. Read the safety information that begins on page vii and “Handling
static-sensitive devices” on page 97.
2. Turn off the server and all attached devices; then, disconnect all power cords
and external cables.
3. Unlock and remove the side cover (see “Removing the side cover” on page
100).
4. Locate the boot block recovery switch 1 on the system board, and remove any
adapters that impede access to the switches (see “Removing an adapter” on
page 102).
1
2
3
4
5
6
7
8
9
10
11
12
DIMM LEDs
Boot block/Clear CMOS
5. Toggle the boot block recovery switch to On.
6. Replace any adapters that you removed (see “Installing an adapter” on page
103); then, install the side cover (see “Installing the side cover” on page 101).
7. Reconnect all external cables and power cords.
8. Insert the update CD into the CD or DVD drive.
9. Turn on the server and the monitor.
After the update session is completed, remove the CD from the drive and turn
off the server.
10. Disconnect all power cords and external cables.
11. Remove the side cover (see “Removing the side cover” on page 100).
12. Remove any adapters that impede access to the boot block recovery switch
(see “Removing an adapter” on page 102).
72 System x3400 Types 7973, 7974, 7975, and 7976: Problem Determination and Service Guide
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