Running the Dell Diagnostics
5-23
following symptoms can be caused by faulty peripherals or software errors, they
might also suggest a port problem:
If a peripheral works intermittently or produces intermittent errors, the port may
be faulty.
If the computer displays an error message that is related to the external device
connected to a port but corrections to the device do not resolve the error, run the
appropriate subtest in the Parallel Ports Test Group.
If the software and the diagnostics do not recognize that you have a parallel port,
check the Parallel Port setting in the System Setup program and, if necessary, run
the appropriate subtest in the Parallel Ports Test Group.
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The subtests in the SCSI Devices Test Group check the functionality of up to four
small computer system interface (SCSI) host adapters and all the SCSI devices
attached to them.
NOTES: Before conducting these subtests on CD-ROM drives, insert a CD with audio
and data tracks (such as a multimedia CD) into each CD-ROM drive. All of the subtests,
except for the Audio Output Test, require a CD with data tracks. The Audio Output Test requires
a CD with audio tracks.
If a CD-ROM drive is empty or if it contains a CD that does not have the required data
or audio tracks (depending on the subtest[s] being conducted), the subtest(s) will fail.
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The seven subtests in the SCSI Devices Test Group and the drive functions they test
follow:
Internal Diagnostic
Causes the device to run its internal self-test.
Seek Test
Checks the device’s ability to search for a specified track on the device and to
position its read/write heads to all tracks.
Read Test
Positions the read/write heads at each block of the device for reading data and
verifies that all tracks on the device can be read correctly.
Write Test
Positions the read/write heads at each block of the device for writing data and
verifies that all tracks on the device can be written to correctly.
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