Power-On Self-Test (POST)
Each time you turn on your computer, it performs a series of tests that
check the 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 “Power-On Password” on page 32.)
If Power On Status is Enabled and 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 “Solving
POST Error Message Problems” on page 88 and “POST Message Charts” on
page 90.
If you hear no beep at all during POST, see “Troubleshooting Charts” on
page 107. You might need to have your computer serviced.
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PC 300GL User Guide
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