This is what I found out about the error code. But why cant it found the boot device "the cdrom"
B1xx 4690 Description: Operating system surveillance time out (AIX to service processor interface failure).
Action:
1. This error code indicates that the operating system terminated early (which usually implies an
operating system crash). This error code may appear in the service processor error log by itself.
However, in the AIX error log, another error points to the cause of the operating system crash.
Use the other error as the starting point for your service action.
If the system will not boot to AIX, power off and look at the service processor error log. Look for
error codes (with time stamps that correspond to the boot that was just attempted) that indicate
hardware failures. If these error codes are found, record them, find the error code listed in the
Chapter 5, gError Code to FRU Indexh, on page 197, and perform the indicated actions.
2. The other possibility is that the operating system was not found during a prior boot attempt. To
determine if this occurred, do the following:
a. Look at the AIX error log entry containing B1xx4690. This is a SCAN_ERROR_CHRP
error with an identifier of BFEC0425. Look at the AIX error log entry containing B1xx4690.
This is a SCAN_ERROR_CHRP error with an identifier of BFEC0425.
b. In the detail data, find the string B1xx4690 (If present, it will be at byte 60 of the detail
data.)
c. Go forward 8 bytes after the B1 to byte 68, and look at bytes 68 and 69. If the values of
bytes 68 and 69 are A2B0, this indicates that the firmware was unable to find a bootable
device in the boot list that is set in the SMS menus. If the system is up, the boot list
problem has been corrected and the B1xx 4690 can be treated as an informational
message with no actions required.
3. Call service support.