Series X cuts off within 30 seconds of power on... why?

Completely umplug your system for 30 seconds. Cut all power to it for at least 30 seconds then plug back in. Seems to he working for me.

Hey there!

Nice to meet you! I'm Darhyl, a fellow gamer. I'm sorry you are experiencing this. I am here to help.

In order to fix this, you will need to perform some basic troubleshooting steps, here's how:

Confirm that both your TV and console are turned on

Check that your TV is set to the correct input signal (HDMI)

Check that the HDMI cable connections to your console and to your TV are secure

Confirm that the HDMI cable is connected to the "out to TV" port on the console

Plug the HDMI cable into a different HDMI port on your TV

Use a different HDMI cable to connect your console to your TV

Connect your console to a different TV

Power cycle your console by pressing and holding the Power button for 10 seconds to turn off the console, and then turning it on again

Please take your time and let me know if it works.

Reference link: https://support.xbox.com/en-US/help/hardware-ne...

Possible Fixes:

1. Remove power from your Xbox Series X or S. First hold down the power button to make sure it’s actually off, then unplug the power cable. Leave the cable unplugged for about 30 seconds to a minute, then plug it back in. Check to see if the Xbox will turn on.
   
2. Power cycle your Xbox Series X or S. This is similar to the first step, but it goes a bit further. Push and hold the power to make sure the console is off. Then unplug the console from power and leave it alone for about 20 to 30 minutes. Finally, plug it back in and turn the power back on to see if it works.
   
3. Check the power outlet. Try plugging a lamp or any other working electronic device into the outlet you use for your Xbox console. If it doesn’t turn on, your outlet may be bad. Try plugging your console into a different outlet. If you’re using a power strip, try plugging your console directly into the wall, or switch to a different power strip.
   
4. Try a different power cable. Both the Xbox Series X and Xbox Series S have internal power supplies that you plug a power cable into. If you have an identical power cable from another electronic device, try swapping the Xbox power cable for another identical one. If the console powers up, you have a bad power cable.
   

Have you performed a Hard Reset?

Holding 5 sec. Power Button untill Power supply turns Orange..

cut of AC power wait 30+ seconds

Restart Console

Hi try powering it off by holding the console power button for 10 seconds. Once off unplug for 30 seconds. Plug back in and power back up