Dell OptiPlex 990 Service Manual page 76

Alert! Security override Jumper is installed.
Description The MFG_MODE jumper has been set and AMT Management
features are disabled until it is removed.
Attachment failed to respond
Description The floppy or hard drive controller cannot send data to the
associated drive.
Bad command or file name
Description Ensure that you have spelled the command correctly, put spaces
in the proper place, and used the correct pathname.
Bad error-correction code (ECC) on disk read
Description The floppy or hard drive controller detected an uncorrectable
read error.
Controller has failed
Description The hard drive or the associated controller is defective.
Data error
Description The floppy or hard drive cannot read the data. For the Windows
operating system, run the chkdsk utility to check the file structure
of the floppy or hard drive. For any other operating system, run
the appropriate corresponding utility.
Decreasing available memory
Description One or more memory modules may be faulty or improperly
seated. Re-install the memory modules and, if necessary, replace
them.
Diskette drive 0 seek failure
Description A cable may be loose or the computer configuration information
may not match the hardware configuration.
Diskette read failure
Description The floppy disk may be defective or a cable may be loose. If the
drive access light turns on, try a different disk.
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