Power-On Self Test - IBM 2283 Hardware Maintenance Service

Power-On Self Test

Each time you power-on the system, the power-on
self test (POST) is initiated. Several items are tested
during POST, but are for the most part transparent to
the user.
POST checks the following:
•
CPU
•
Cache Memory
•
Hard Diskette Drive(s)
•
Mouse
To start POST, turn on the monitor and then the
system unit. The following will happen:
1. The IBM Personal Computer logo will appear on
the screen.
2. At this time one of two hot-keys may be used. The
F1 key will cause the system Configuration/Setup
Utility menu to appear. The Esc key will switch the
graphical IBM logo screen to the traditional text-
based system startup screen, which displays
information of BIOS version, CPU, Hard Diskette
Drive(s), CD-ROM, Mouse and system memory.
3. If an error is detected during POST, the IBM logo
screen will automatically switch to the text-based
screen and display the error message or code with
a beep. Depending on the criticalness of the POST
error, the system may halt and/or display the
message "Press <F1> to enter to the Setup or
<Esc> to continue..."
4. During the POST, press <F12>, a Boot Menu will
appear. You can decide Boot options here or in
system Configuration/Setup Utility menu, Startup
sub-menu.
If this message appears, pressing the Esc key will
allow the system to attempt to proceed despite the
reported error; pressing F1 will cause the system
Configuration/Setup Utility menu to appear.
•
Memory Size
•
Memory Speed
•
CD-ROM
•
BIOS Version
Diagnostic Aids 81