Problems preheating anycubic i3 mega

Good afternoon,I expose a problem that has happened to me suddenly with my printer.

The problem is that I can no longer print anything because when I preheat it, it simply does nothing.

The printer keeps making noise when I hit the screen but the temperature does not change.

If I give it to print directly it does not heat anything either.

Here you can see the problem:

https://youtu.be/17Jrr2BCpT0I

Hope you can help me because I don't know what to do! Thank you!