Compaq Contura 400 Maintenance And Service Manual page 273

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Chapter 5.3 Troubleshooting without Error Messages
This section contains troubleshooting information that provides a quick
reference for diagnosing problems that cannot be identified by running
POST or Computer Checkup (such as a non-functional display that does not
allow viewing error messages).
tables 5-12 through 5-27 in Section 5.3.
Since symptoms can appear to be similar, carefully match the symptoms of
the computer malfunction against the problem description in the
troubleshooting tables to avoid a misdiagnosis.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> WARNING <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
To avoid a potential shock hazard during troubleshooting procedures,
disconnect all power sources before removing the keyboard assembly or the
display bezel.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>><<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
Before Replacing Parts When Troubleshooting
When troubleshooting a problem, check the following list for possible
solutions before replacing parts:
o Verify that cables are connected properly to the suspected defective
parts. Try reseating the cables even if they appear to be properly
connected.
o Run Computer Setup after connecting external devices.
o Verify that all required device drivers are installed.
o Verify that all required changes have been made to the CONFIG.SYS file.
o Verify that all required changes have been made to the AUTOEXEC.BAT
file.
o Verify that printer drivers have been installed for each application.
Table 5-12. Solving Power Problems
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Problem
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Computer will not turn
on when plugged in and
battery pack is
inserted.
2. Clean trackball.
3. Ensure trackball connector
4. Replace the trackball
5. Replace the system board.
For additional information refer to the
Probable Cause
AC Adapter may be
defective.
is seated properly.
assembly.
Solution(s)
1. Replace AC Adapter.
2. Remove battery pack;
insert another battery
pack and try to turn on
computer again.