If it's not you should go to the following article for No POST troubleshooting. The next step is to check whether the power button might be at fault.
The LED light should stay on for 3 seconds and then turn off.After 15 seconds, connect the power cord back to the PSU.Disconnect the power cord from the PSU, and wait for 15 seconds.How to run self-test without the button on the PSU Resolve No Power, No POST, No Boot or No Video issues with your Dell Computer.The next step would be to isolate the source of the power failure by disconnecting parts from the PSU, you should go to the following article for No Power troubleshooting. If the BIST LED does not light up or the PSU fan does not spin correctly, then the power supply can not deliver power to the system and could be caused by any component connected to the power supply or the power supply itself.If it is not, you should go to the following article for No POST troubleshooting. If the fan is not spinning up properly this should be considered a BIST failure even if the LED lights up. The light should be solid on not flickering or flashing and the power supply fan should also turn on to speed.Press the BIST button on the system and check whether the LED lights up.
How to use the BIST to diagnose power supply issues? How to run self-test using the button on the PSU
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