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Diagnostic Aids 77
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 is for the most part transparent to
the user.
POST checks the following:
To start POST, power-on the monitor and then the
system unit. The following will happen:
1. The IBM 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 Setup Utility menu to
appear. The F9 key will switch the graphical IBM
logo screen to the traditional text-based system
startup screen, which displays BIOS version and
system memory tested. The F9 key will only work
after exiting BIOS Setup.
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 criticality of the POST
error, the system may halt and/or display the
message “Press <F1> to enter to the Setup or
<Enter> to continue...”
If this message appears, pressing the Enter key
will allow the system to attempt to proceed despite
the reported error; pressing F1 will cause the
system Setup Utility menu to appear.
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System Board
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Keyboard
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Memory
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Mouse
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VGA Controller
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CD-ROM Drive(s)
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Hard Disk Drive(s)
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Sound Controller*