Dell OptiPlex 780 Ultra Small Form Factor Service Manual page 25

Another failure has
occurred.
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Repeat this process for each expansion card installed. If the computer
starts normally, troubleshoot the last card removed from the
computer for resource conflicts.
If the problem persists, contact Dell.
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.
If the problem persists, contact Dell.