CDJ-850 stuck on power on.

Hello to all,

I have a problem with one of my cdj.

When I press the power button, the item doesn't boot, it stay lit with display, input select button and loop selection like in this photo attached below:

https://s28.postimg.org/res81eq8t/Full_Size_Render.jpg 

I try to do a factory reset, holding usb select and back when press power on but it doesn't enter in the factory reset mode.

What can i do again?

I would try a firmware update but i don't know if there is an hardware failure and I don't want to make my player a brick.

Thanks a lot.

Mario.