Causes of abnormal IPLs

These situations can cause an abnormal initial program load (IPL).

Using the End Job Abnormal (ENDJOBABN) command. To see if this command has been used, look for message CPC1124 in the job log.
Using option 7 (Start a service tool) and then option 7 (Operator panel function) on the Dedicated Service Tool (DST) menu.
Using the Power button (on the control panel) instead of the Power Down System (PWRDWNSYS) command.
Displaying a power failure before all data is written from main storage to disk.
Using any B900 xxxx system reference code (where xxxx is any number or letter) during the start of the operating system phase of the IPL.
Ending with a system reference code of B900 3F10, if the PWRDWNSYS command did not complete processing.
Causing the system to end by any function check in the controlling subsystem.
Issuing a PWRDWNSYS command in the primary partition without first powering down secondary partitions.
The system going down when database recovery has not completed during the IPL.

Note: If the ENDJOBABN command is issued, message CPI0990 will be in QHST. For all other reasons, message CPI091D will be in QHST stating why the IPL is abnormal.