IBM 201 manual Recovering BIOS

Table 6. Power error messages	(continued)
Message		Action
System under recommended voltage on		1. Check connections to power subsystem
3.3 v (level-warning; 3.3 volt supply under
		2.	Replace power supply
nominal value)
		3.	Replace power backplane
System under recommended X current		1. See “Power problems” on page 57
(level-non-critical; system drawing less
current than recommended on voltage ″X″)
″X″ V bus fault (level-critical; overcurrent		1. Check for short circuit on ″X″ voltage bus
condition on ″X″ voltage bus)
		2. See “Power problems” on page 57
12V ″X″ bus fault (level-critical; overcurrent		1. Check for short circuit on 12 volt ″X″ voltage bus
condition on 12 volt ″X″ voltage bus)
		2. See “Power problems” on page 57
5V fault (level-critical; overcurrent condition		1. Check for short circuit on 5 v bus
on 5 V subsystem)
		2. See “Power problems” on page 57
240 VA fault (level-critical; overcurrent or		1. See “Power problems” on page 57
overvoltage condition in power subsystem)

Recovering BIOS

If your BIOS has become corrupted, such as from a power failure during a flash update, you can recover your BIOS using the recovery boot block and a BIOS flash diskette.

Note: Note: You can obtain a BIOS flash diskette from one of the following sources:

vDownload a BIOS flash diskette from the Web site at http://www.ibm.com/storage/support/nas

vContact your IBM service representative.

The flash memory contains a protected area that cannot be overwritten. The recovery boot block is a section of code in this protected area that enables the NAS 200 to start up and to read a flash diskette. The flash utility recovers the system BIOS from the BIOS recovery files on the diskette.

To recover the BIOS:

1.Power off the NAS 200 and peripheral devices. Disconnect all external cables and power cords. Remove the cover.

2.Locate the boot-block jumper block (J16) on the system board. See Figure 2 on page 59.

3.Place a jumper on pins 2 and 3 to enable the BIOS backup page.

4.Insert the BIOS flash diskette into the diskette drive.

5.Restart the NAS 200.

6.When the NAS 200 completes POST, select 1 -- Update POST/BIOS from the menu that contains various flash (update) options.

7.When you are asked if you would like to move the current POST/BIOS image to the backup ROM location, type N. Attention: Typing Y will copy the corrupted BIOS into the secondary page.

8.When you are asked if you would like to save the current code on a diskette, select N.

58NAS 200 User’s Reference