X axis stopped working

Hi.

Im having a situation here. When I started my first test print (vertex logo) I noticed that the print is super inaccurate
https://goo.gl/photos/TzgDt9eQmdxtUChe6

so I stopped by pressing Kill Print, head moved from the center (print job) to the rear of the printer on Y axis and stopped (no X axis move). After that now when I press ‘Auto home’ head moves (wherever it is) to 0 at Y axis, and when it should move to 0 at X axis it only made a sound but head does not move, and after few seconds the Z axis (bed) moves.
Here is the video:
https://goo.gl/photos/SfMRm1JWY62BMNsCA

I was thinking it might be the problem with X/Y axis alignment, but when I loose belts the head slide almost freely when I tilted the printer. With belts on head move easy if I do it manually by hand. Same if I try to move the head via Repiter-Host, it goes in Y and Z axis but no X.

Did something happened to the X motor?

Ok. Sort it. Pulley slid from the motor.

The pulley on the motor is thightened well?

Edit: O, you just had a solution already…

Yes. Thank you.