Dell OptiPlex 780 - Manual (Page 16)

No memory modules
are detected.
If two or more memory modules are installed, remove the modules, then
reinstall one module and restart the computer. If the computer starts
normally, continue to install additional memory modules (one at a time)
until you have identified a faulty module or reinstalled all modules
without error.
If available, install working memory of the same type into your
computer.
If the problem persists, contact Dell.
Memory modules are
detected, but a memory
configuration or
compatibility error has
occurred.
Ensure that no special requirements for memory module/connector
placement exist.
Ensure that the memory you are using is supported by your computer
(see the "Specifications" section for your computer).
If the problem persists, contact Dell.
A possible expansion
card failure has
occurred.
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.
If the problem persists, contact Dell.
Another failure has
occurred.
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.
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