Xbox One S turns off 2 seconds after turning on.

Ok, I hope that you better success this time around.

Hello xbox!

Have you tried troubleshooting the power supply?

Give these steps a try and see how that works for you:

Important Be sure to try all of the following solutions. If you don't, you could mistakenly request a new power supply when it's your console that needs repair.

Reset your internal power supply

The Xbox One S and Xbox One X have an internal power supply that works in all regions worldwide. If your console won't turn on, it may simply need a power reset. Often, power issues are due to the power supply resetting after a power surge.

To reset the internal power supply, follow these steps:

1. Unplug the power cord from the console.

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1. Wait 10 seconds.
2. Plug the cord back into the console, and then press the Xbox button on the front of the console.

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If the console turns on, the internal power reset worked. Do this step in the future if the problem happens again.

If the console still doesn't turn on, try the following:

• Check that the wall outlet you are using is working with other devices.
• Check that the power cable is firmly connected to the wall outlet and to your console.
• Ensure that you're using the power cable that came with your console, and that it's the correct cable for your region.
• If your console still will not turn on, it will need to be serviced. To request service, sign in to the Device Support page with your Microsoft account credentials and submit
  a service order.

Other options:
Instant-on mode

When you’re set to instant-on, you’re able to:

• Start up faster
• Wake with your voice (where available)
• Turn TV and cable or satellite on with your console

To change this setting:

1. Press the Xbox button to open the guide.
2. Select System > Settings > Power & startup.
3. Select Power mode & startup, and then select from the Power mode drop-down menu to change the setting.

Energy-saving mode

In energy-saving power mode, your console is shut down to save energy. In this mode:

• Your console takes 45 seconds to start up.
• You must press the Xbox button to start the console.

To change this setting:

1. Press the Xbox button to open the guide.
2. Select System > Settings > Power & startup.
3. Select Power mode & startup, and then select from the Power mode drop-down menu to change the setting.

unplugging for 10...seconds then plugging back in and turning on. I see you found something that ive tried. Still doesnt work after trying it again.

cant try any other options because my xbox cant turn on.

Sorry to hear that. Your next step would be requesting a repair through https://support.microsoft.com/en-us/devices

going to 'local' store may 22nd at 10am. Requesting a repair will take 11 days - 1/2 month or 7-11 days if i want to pay. this was suggested by support