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Troubleshooting
Verify that all test equipment works before using it to test a
malfunctioning component.
Verify that a component is the only malfunctioning part of the
computer by replacing the malfunctioning component with a
properly functioning one, and then try to run the system. For
example, if you have tested an FDD in a test computer and
found it to be bad, you should also try a good FDD in the
malfunctioning FDD's computer to be sure that another
component (such as the FDD controller) is not bad as well.
As with assembly and disassembly, make sure you have
adequate lighting, the right tools, and a stable clean working
environment.
The examples that follow provide useful tips and information that
will help isolate and solve some of the more common problems
that may be encountered.
System Start Failure
When you turn on the computer, the system hangs before
completing or starting the POST (power on self test). Power
supply failure, post failure, and boot-up failure can result in a
system start failure.
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