Dell OptiPlex 980 Service Manual page 25

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configuration or
compatibility
error has
occurred.
A possible
expansion card
failure has
occurred.
Another failure
has occurred.
Ensure that the memory you are using is supported by your computer.
Determine if a conflict exists by removing an expansion card (not a
graphics card) and restarting the computer.
If the problem persists, reinstall the card you removed, then remove a
different card and restart the computer.
Repeat this process for each expansion card installed. If the computer
starts normally, troubleshoot the last card removed from the computer for
resource conflicts.
Ensure that all hard drive and optical drive cables are properly connected
to the system board.
If there is an error message on the screen identifying a problem with a
device (such as the floppy drive or hard drive), check the device to make
sure it is functioning properly.
If the operating system is attempting to boot from a device (such as the
floppy drive or optical drive), check system setup to ensure the boot
sequence is correct for the devices installed on your computer.