Solved: Dell Optiplex 780 Error Messages/Diagnostic Codes Power Button and then 1 and 3 number lights flash - Dell Community
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OptiPlex 780 - Steady orange power button light + numbers 1 and 2 blink every 1.5-2 seconds. - Dell Community
![Control Lights And Diagnostic Lights - Dell OptiPlex 780 Setup & Features Manual [Page 6] | ManualsLib Control Lights And Diagnostic Lights - Dell OptiPlex 780 Setup & Features Manual [Page 6] | ManualsLib](https://data2.manualslib.com/first-image/i8/38/3713/371220/dell-optiplex-780.jpg)
Control Lights And Diagnostic Lights - Dell OptiPlex 780 Setup & Features Manual [Page 6] | ManualsLib
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