The power transformer was indeed plugged in the power outlet socket but wasn't making a good contact so.... there was no power on the scanner.
The reason why I didn't noticed it before is as it was connected into the outlet socket, I always assumed it was in fact connected and with power... And as it is difficult to reach to the cables (they are behind the desk and the shelves, near the wall) I never went there with multimeter (like I did today) to really verify if there was power or not.
And as the printer passes through the scanner, there was no printer either!
Well, its solved and the document I need already printed.
So I must go, now.
See you all latter!