Xbox series x willnot start UP. Any ideas?

Hello Henke71, My name is Khaji I am the independent advisor and I will be happy to help you today.

If your Xbox Series X doesn’t start and you experience a lack of energy or unusual sounds, here are some troubleshooting steps you can try:

1. Make sure the power cable is securely connected to both the Xbox Series X and the power outlet. Try unplugging the power cord from both ends and then plug it back in firmly.

2. Perform a power cycle by completely turning off the console. Press and hold the Xbox button on the front of the console for about 10 seconds until it turns off completely. Then, unplug the power cable from the back of the console and wait about 10 seconds. Then plug the power cord back in and try turning on the console again.

3. If possible, try plugging the console into a different outlet to rule out any issues with the power supply. Make sure the outlet is working properly and providing power.

If none of the above works then you will have to request a repair for the console since it is most likely a hardware problem. In this case, I recommend you enter the following link: support.xbox.com/help/hardware-network/warranty-service/getting-your-product-serviced

Thank you very much for your patience and understanding! If you need anything else, do not hesitate to contact us again.

Might be worth checking out this thread in case there's any ideas in it....fyi it is a lengthy thread so might be prudent to start at the end and work backwards:

Xbox Series X won't allow monitor to do 1440p at 120hz - Microsoft Community

Hey! Any luck with a fix to this yet? My discord does the same thing with my Series X. Problems just randomly started popping up

I have the same issue on my Xbox series X I hard reset the console and now its worse than before I reset it. I started up my Xbox one X and no issues with that when I started up a game.

It's a great idea. On one hand your games and apps will still look much better compared to the Xbox One and One S. Secondly once the Series X comes out. You will be able to play Serie X games on the world's current most powerful console the Xbox One X
for up to 2 years. This includes triple A titles like Halo Infinite.