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 33.)
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 errors” on page 92 and
“Troubleshooting MAP” on page 89.
If you hear no beep at all during POST, see “Device troubleshooting charts”
on page 97. You might need to have your computer serviced.
88
PC 300GL User Guide
Summary of Contents for 628816U - PC 300 GL
Page 1: ...PC 300GL User Guide Types 6268 6278 and 6288...
Page 2: ......
Page 3: ...PC 300GL User Guide Types 6268 6278 and 6288 IBM...
Page 14: ...xii PC 300GL User Guide...
Page 62: ...48 PC 300GL User Guide...
Page 66: ...52 PC 300GL User Guide...
Page 76: ...4 Rotate the power supply toward you slightly 62 PC 300GL User Guide...
Page 97: ...Desktop Tower Chapter 6 Installing options 83...
Page 142: ...128 PC 300GL User Guide...
Page 166: ...152 PC 300GL User Guide...
Page 174: ...IBM Part Number 37L2165 Printed in U S A July 1999 37L2165...
