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Verify all test equipment works before using it to test a malfunctioning component.
Verify 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 a diskette drive has been tested in a test computer and has been
found to be bad, test a working diskette drive in the malfunctioning diskette drive's
computer to be sure another component (such as the diskette drive controller) is not bad
as well.
As with assembly and disassembly, make sure to have adequate lighting, the right tools,
and a stable clean working environment.
The following examples 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 the computer is turned on, the system hangs before completing or starting the
POST (power on self-test). A power supply failure, POST failure, or boot-up failure
can result in a system start failure. Reset the system by pressing the reset button located
on the rear of the computer next to the PS/2 connector (Figure 1-3) and restart the
system.
3-2
Troubleshooting
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