Samsung Xpress C480w - Problems with wake up - with a button press.

[spree]

Problems with wake up - with a button press.
When I push the button - the printer sleeped.
When I push the button - the printer do not want to wake up (the printing from computer, direct with USB cabel do not work, too).
I changed:
- formatter board (nothing changed)
- power board (nothing changed)
- PBA connector (nothing changed)
What do you think is wrong?
And one more detail: when I push the button - to sleep - at the other printer I hear click sound, but at this printer nothing - where could be this click sound?

[spree]

I updated latest firmware and it is working.