Xbox one S turns on and then turns off immediately.

When I press the on button:

1. the Xbox starts up with the on beep
2. The button light dims; and
3. Then it shuts down with off beep 1-2 seconds later.

Have detached the external hard drive and tried disconnecting the power for several mins.

I can't do a factory reset as the machine won't stay on for more than 2 seconds, regardless of what buttons I press.

Try holding down on the small button underneath the xbox logo on the console and that xbox button on the console until it starts flashing then wait until the light is solid and isn't flashing.

See if this
Troubleshoot Xbox One unexpectedly turning off works, and let us know if it fixed.

I've had the same problem. Mine started a few weeks ago. Mine happened around the time of a bad lightning storm, and I had everything plugged into the surge protector, but was useless.

I try to do a hard reset and when I first try turning it on, nothing happens. Then after a few button pushes, I get the light on and it shuts off. Then after a few more, I even get the fan going and then it shuts off. Never get the Xbox screen.

I have also tried all the options and replaced the power cord because some mentioned the 7a cord that came with it originally wasn't enough power. Nothing. I am considering trying to replace the power supply or motherboard, but don't know if its worth spending
$60-80 for a part and then it not work, especially when the new system is out soon.

I was hoping there would be more people on these forums posting this issue, but doesn't seem that way.

My pleasure and hope to see you online and back up and running sooner than later.

Thank you for your help