xbox one start up saying system error E102 10040C02 80004005

Try performing a hard reset EXACTLY like this. Hold the power button on the console for 8 seconds or until the power shuts down completely. Unplug the power cord from the back of the console for 5 minutes. Plug the power cord back in and restart
the console.

Hey there bud thanks for taking the time to bring this issue to us.

If the steps listed on our Troubleshoot Xbox One startup errors page have been attempted the next step would be a repair of the console,
for this, we have a few options. First we suggest checking out our
Device page or for a more involved, step by step way
Request a Callback from one of our Xbox Support Specialists and we will be more than glad to handle it on our end. Give it a shot and let us know how it goes!

"I've tried the USB factory reset, along with the Sync/Eject shortcut with the exact same results. The error that keeps coming up is (E102 10040C02 80004005). E102 is a failure to boot/ error when booting up, hence the previous troubleshooting."

If you are in a Insider preview, you cannot use USB factory reset, (OSU) unless you unenroll from the preview first.

E102 error generally means the hardware is failing and you will need to setup a repair if you can't get to the troublshooting screen when you boot up.

Hello reubenwenster,

Thank you for your post. I understand you are experiencing an issue with receiving error code E102 when your Xbox One starts up. To troubleshoot this, please visit this article:

Error E102 Solution.

I hope this helps.

I found this information regarding the E102 error. The issue may be resolved by doing a factory reset.

https://appuals.com/xbox-one-system-error-e102/