Go to Dell Support > Optiplex 780 Desktop PC > Manuals & Documentation > Dell Optiplex 780 Service Manual,
http://www.dell.com/support/troubleshooting/us/en/19/Product/optiplex-780Diagnostics > Diagnostic Lights,
"Problem Description - A possible expansion card failure has occurred"
"Suggested Resolution -
1) Determine if a conflict exists by removing an expansion card (Not a graphics card) and restarting the computer.
2) If the problem persists, reinstall the card you removed, then remove a different card and restart the computer"
Be SURE to follow Anti-Static Procedures.
Regards,
joecoolvette
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