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If the response when you press a mouse button is different from the usual or
anticipated response, the button contact may be damaged.
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A mouse button does not work at all.
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The cursor does not respond on the screen in accordance with the movements
you make with the mouse.
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The Diskette Drives Test Group tests both 5.25-inch and 3.5-inch diskette drives. The
tests are listed in Table 7-7 .
A diskette drive problem can appear to be a diskette problem because defective dis-
kettes produce faulty-drive error messages. Dell recommends running the Diskette
Drives Test Group more than once using diskettes from different sources.
The following symptoms usually suggest a drive problem and warrant running a test in
the Diskette Drives Test Group:
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An error message appears on the screen stating that the computer cannot read
from or write to a diskette.
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A diskette cannot be properly formatted, or format error messages appear on the
screen.
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Data on diskettes is corrupted or lost; these problems may be intermittent.
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Change Line
Checks for bent pins on the diskette drive controller and for
defective lines on the diskette cable.
Seek
Checks the drive's ability to search for a specified track on the
diskette and to position its read/write heads to all tracks.
Read
Positions the read/write heads at each cylinder of the diskette
for reading data and verifies that all tracks on the diskette can be
read correctly.
Write
Positions the read/write heads at each cylinder of the diskette
and verifies that all tracks on the diskette can be written to
correctly.
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The IDE (ATA/ATAPI) Devices Test Group checks the functionality of up to four devices
(two on each channel) of any capacity as well as the hard-disk drive controller.
Table 7-8 lists the tests.
If you check a hard-disk drive to determine the amount of available space, your operat-
ing system will probably report problem areas. Most hard-disk drives have a small
amount of space that is not usable. Identification of unusable disk space, unless it is
Running the Dell Diagnostics
7-13
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