0x8004886A is my errorcode, when I try to log into the X-Box app. Found nothing about ist...

It is an outage. You can follow the situation here and press notify me when is over.

And my One X does nothing, no errorcode, nothing

When I opened the x box app back up. Nothing asked to reinstall game services

I have nothing but trouble with the x box app. I can't login because of the error above. The weird thing is that my friend can see me online an I get the notification that I am login but on the app the error appears and I should try it later again.
I did some research and no one seems to have found out how to fix this problem really. I tried a lot of "solutions" already but nothing works. The xbox app is an insult to all players.

I earlier today set my X-Box 360 S (250GB, like above) to automatically continue downloading my Active Downloads queue. I started up the console while the things were still downloading. It took a while at the X-Box 360 start-up screen. I didn't think this
was a big deal. However, when the system finally got me into the home-page for my console, I couldn't access profiles, I couldn't access saves, nothing. I decided to redownload my gamertag from X-Box LIVE and found that my system wasn't recognizing my HDD.
After seeing what you said about the memory section, I went to take a look. I found that my HDD was also "Unformatted". I certainly hope that I'm able to re-download everything again, because last night I spent roughly $200 on X-Box 360, X-Box, and Arcade
games on the marketplace. It irks me highly that this happened so spontaneously, as well. It just decided to quit on me when I started it up.