Dell optiplex 9010 AIO no POST issue.

Having an issue with a Dell optiplex 9010 AIO not performing its normal POST behavior. When I press the power the machine starts lights,fans kick on but no Dell log indicating POST. The computer will shut off after a few minutes and try to start again. I am not getting any amber lights or beeps the power comes on and the fans spin up their is no POST. I tried connecting an external display, unplugged all the devices, tried another PSU and RAM.

I believe that the issue is either the motherboard or the CPU and i'm leaning towards the motherboard.   

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RE: Dell optiplex 9010 AIO no POST issue.

Did you try connecting an external monitor to the AIO VGA out port to see if the external monitor shows a boot screen?

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