Lenovo PC 300PL IBM PC300GL User Guide 6563, 6564, 6574 - Page 114

Power-on self-test POST

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Power-on self-test (POST) Each time you turn on your computer, it performs a series of tests that check the basic operation of the base computer. This series of tests is called the power-on self-test (POST). POST does the following: Checks basic system board operations Checks the memory operation Compares the current system configuration with that established by the Configuration/Setup Utility program Starts the video operation Verifies that the diskette drives are working Verifies that the hard disk drive and the CD-ROM drive are working If Power-On Self-Test is set to Enhanced, numbers showing the amount of memory being tested appear in the top-left corner of the screen until the total amount of memory in the system is reached. Options for running a quick POST or accessing the Configuration/Setup Utility program appear in the lower-left corner of the screen. Quick mode is the default mode of operation. Note: The amount of available memory shown might be somewhat less than expected because of basic input/output system (BIOS) shadowing in random access memory (RAM). If POST finishes without detecting any problems, the first screen of your operating system or application program appears if you have not set a power-on password. If you have set a power-on password, a password prompt appears. You must enter your password before the first screen of your operating system or application program will appear. (For more information on using passwords, see "Using a power-on password" on page 41.) If Power On Status is Enabled and POST detects no problems, you will hear a single beep. If POST detects a problem, you will hear multiple beeps or no beep. In most cases, an error code appears in the top left corner of the screen, and in some cases a description of the error is displayed beside the code. (Note that the screen will sometimes display multiple error codes and descriptions.) For more information about what caused an error message to appear and what action to take, see "POST error" on page 100 and "Troubleshooting MAP" on page 97. If you hear no beep at all during POST, see "Device troubleshooting charts" on page 105. You might need to have your computer serviced. 96 PC 300GL User Guide

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Power-on self-test (POST)
Each time you turn on your computer, it performs a series of tests that
check the basic operation of the base computer.
This series of tests is called
the
power-on self-test (POST)
.
POST does the following:
±
Checks basic system board operations
±
Checks the memory operation
±
Compares the current system configuration with that established by the
Configuration/Setup Utility program
±
Starts the video operation
±
Verifies that the diskette drives are working
±
Verifies that the hard disk drive and the CD-ROM drive are working
If
Power-On Self-Test
is set to
Enhanced
, numbers showing the amount of
memory being tested appear in the top-left corner of the screen until the
total amount of memory in the system is reached.
Options for running a
quick POST or accessing the Configuration/Setup Utility program appear in
the lower-left corner of the screen.
Quick mode is the default mode of
operation.
Note:
The amount of available memory shown might be somewhat less
than expected because of basic input/output system (BIOS)
shadowing in random access memory (RAM).
If POST finishes without detecting any problems, the first screen of your
operating system or application program appears if you have not set a
power-on password.
If you have set a power-on password, a password
prompt appears.
You must enter your password before the first screen of
your operating system or application program will appear.
(For more
information on using passwords, see “Using a power-on password” on
page 41.)
If
Power On Status
is
Enabled
and POST detects no problems, you will hear
a single beep.
If POST detects a problem, you will hear multiple beeps or
no beep.
In most cases, an error code appears in the top left corner of the
screen, and in some cases a description of the error is displayed beside the
code.
(Note that the screen will sometimes display multiple error codes and
descriptions.)
For more information about what caused an error message to
appear and what action to take, see “POST error” on page
100 and
“Troubleshooting MAP” on page
97.
If you hear no beep at all during POST, see “Device troubleshooting charts”
on page
105.
You might need to have your computer serviced.
96
PC 300GL User Guide