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Power-on self-test (POST)
When you turn on the computer, the power-on self-test (POST) performs a series of
tests to check the operation of system components and some of the installed
options.
If POST finishes without detecting any problems, the first window of your operating
system or application program appears.
If POST detects a problem, more than one beep might sound, an error message
might appear on your screen, or both.
Notes:
1. If you have a user password set, you must type the password and press Enter,
2. A single problem might cause several error messages. When this occurs, work
POST beep codes
The possible types of beep codes are:
No beeps
Continuous beep
Beep codes for specific failures
when prompted, before the operating system will load.
to correct the cause of the first error message. After you correct the cause of
the first error message, the other error messages typically will resolve the next
time you run the test.
No beep codes indicates that your computer successfully completed POST
without finding any errors.
Your startup (boot) microprocessor has failed, or your system board or
speaker subsystem might contain a failing component. If the system
continues through POST with no errors, call for service. If no video appears,
the startup processor has failed.
Beep codes indicating specific system problems are listed in the following
table.
Table 3. POST beep codes
Beep code
Description
1-1-2
Microprocessor register test has failed.
1-1-3
CMOS write/read test has failed.
1-1-4
BIOS EEPROM checksum has failed.
1-2-1
Programmable Interval Timer test has failed.
1-2-2
DMA initialization has failed.
1-2-3
DMA page register write/read test has failed.
1-2-4
RAM refresh verification has failed.
1-3-1
First 64 Kb RAM test has failed.
1-3-2
First 64 Kb RAM parity test has failed.
Action
Call for service
Reseat the
memory modules
or install a
memory module. If
the problem
remains, call for
service.
Chapter 5. Solving problems
63
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Troubleshooting
