User`s guide

2-3
Using the System
POST Indicators
POST (Power–On–Self–Test) indicators indicate tests that are being performed as the
system is preparing to load the operating system. The POST indicators are words that
display on the system console. Each time that the system starts a different step in the
POST, a POST indicator word appears on the console. Each word is an indicator of the tests
that are being performed.
The POST screen displays the following words:
Memory
Memory test
Keyboard
Initialize the keyboard and mouse. The time period for pressing a key to access the System
Management Services, or to boot from a default boot list is now open. See ”POST Keys” on
page 2-4 for more information.
Network
Self–test on network adapters
SCSI
Adapters are being initialized
Speaker
Sounds an audible tone at the end of POST
Checkpoints
During power–on self–test (POST), four–digit checkpoints are displayed in the operator
panel display indicating the progress of the testing. If an error is detected that requires
attention, the system unit halts with an eight–digit error code displayed in the upper row of
the operator panel display, starting in the leftmost position. This eight–digit error code
identifies the error.
The four–digit checkpoints are in the form of nnnn, where n is an alphabetic or numeric
character.