Thanks for your answer.
Aw i said in my post, i tried without RAM and i can't hear anything.
I tried clear CMOS and the result is the same.
CMOS battery was off so i replace it with a new one.
Also the diagnostic leds ( rear panel ) are all off.
Where is the board speaker? I can't find it. Maybe is disconected so i can't hear anything.
What else can i do to ensure that the board is defective?
Thanks again for your time