Optiplex 780 diagnostic lights 1 & 4 with solid amber power light

[Christozoid]

My Optiplex 780

- will not post

- will not beep

- will not output any video

When I push the power button, 

- Diagnostic lights 1 & 4 flash

- Power button is of solid amber

When I turn the computer off:

- if I press the Power Supply test button, it illuminates green

If I disconnect the power cable

- A tiny LED on the circuit board (next to AUX PWR label) stays amber for a minute or two.

Diagnostic lights 1 & 4 are not documented in the Dell manual. I have tried to disconnect all peripherals, all drives, all cards, even all RAM, still no POST no beep, no video: just the fan running, and diagnostic lights flashing.

Any hope for this computer? 

[DELL-Hemalatha]

Hi CHRISTOZOID 

Thanks for writing to us. 

Diagnostics led 1 & 4 indicate power connector faulty. Please reseat the PSU connector if not yet done. 

If issue still the same, then consider replacing the PSU . Sometimes the PSU connector on the motherboard to be faulty. 

Do let us know how it goes post reseating the PSU connector.

Regards

[DELL-Hemalatha]

Hi we are awaiting your response.

[mkuso]

i have dell optiplex 780. i have a problem of solid amber light.I have cleaned ram,cleaned  CMOS but problem continues  how can i solve it?pc turns on,fans are working normally but no display on the monitor

[speedstep]

Solid Amber Power Button is Bad Motherboard.

You did not say which SIZE you have.

The Optiplex 990 says this.

1    4   MBF (Motherboard Failure) is well documented.