Pioneer A-A6 MK2 not turn on, zero function

i have a Pioneer A-A6 MK2 it worked fine but from one day to another, it stopped working. Hopefully one of you has a clue about whats wrong with it!

First of all, let me tell the symptoms:

1: powercable is connected
2: main powerswitch is pushed
3: reaction of the amp: the blue led inside the powerbutton does not light up, the display at the front stays dark, also the blue leds inside of the amp. 

the red led of the directbutton lights up.

4: no reaction on any controlbuttons

i checked the mainfuse - its okay....